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    Home » Recipes » Bars Brownies & Slices » Baked Lemon Slice | Classic Recipe

    Baked Lemon Slice | Classic Recipe

    Published: Jan 12, 2022 · Modified: Jan 12, 2022 by Lucy · This post may contain affiliate links · 42 Comments

    Jump to Recipe
    Squares of baked lemon slice with lemon frosting, served on a white cake stand

    The easiest and most delicious Baked Lemon Slice recipe with a creamy and tangy lemon frosting. A classic slice that's ready to eat in less than 1 hour and is perfect for morning tea or school lunchboxes.

    Pieces of a baked lemon slice on a white cake stand

    When you feel like baking a classic, comforting slice then my baked lemon slice is exactly what you need.

    Simple to prepare, the light and fluffy cake-like base is perfectly complemented by the smooth and creamy lemon frosting.

    Just like my Easy Chocolate Coconut Slice, Passionfruit Slice, Jelly Slice and Mars Bar Slice, this recipe takes just a few minutes to prepare and is as popular today as it was 50 years ago!

    Lemon frosting on pieces of a golden slice, served on a cake stand

    Why You're Going To Love This Recipe

    If you've been visiting my blog for a while then you'll know that my key principle is to make delicious food without any fuss.

    If it's easy to make, quick, and tastes fabulous - then I'm all in!

    And this Baked Lemon Slice recipe is all those things... plus so much more.

    • Basic pantry & fridge staples - I wouldn't be surprised if you find that you have all the ingredients on hand already. Made from basic pantry and fridge staples, this is a great recipe to whip up when you want to avoid an extra trip to the supermarket.
    • Time saver - just mix the ingredients together in one bowl and then bake - all in just 30 minutes. Wait for the slice to cool and then smother it in luscious creamy frosting.
    • Most popular recipe - this is the perfect recipe to enjoy with friends over a coffee. A beautiful freshly baked, moist and tangy lemon slice is always popular.
    • Freezer friendly - yes, you can freeze this slice too! Perfect for 'grab and go' lunchbox fillers.
    A close up of baked slice with lemon frosting on top

    What You Need

    There's absolutely no fancy ingredients required for this simple baked lemon slice.

    Note: Please scroll to the recipe card at the bottom of the post for ingredient quantities and the full detailed method.

    For The Base

    All the ingredients for baked lemon slice in individual bowls
    • Butter - either salted or unsalted butter can be used in this recipe.
    • Caster sugar - I recommend using caster sugar rather than regular granulated white sugar as it dissolves easier when creamed with butter making it the perfect sugar for cakes, cupcakes, slices and desserts.
    • Lemon zest - from one lemon. See how to zest a lemon here.
    • Eggs - at room temperature.
    • Lemon juice - from one lemon, or alternatively use store bought lemon juice.
    • Baking powder
    • Plain flour - also known as all-purpose flour.

    For The Lemon Frosting

    Ingredients for lemon frosting in individual bowls
    • Icing sugar - use pure icing sugar as it will set the frosting firmer than icing sugar mixture.
    • Butter - either salted or unsalted butter can be used in this recipe.
    • Lemon juice - it is preferable to use fresh lemon juice, but if fresh lemons aren't available then store bought lemon juice makes a great substitute.

    Step By Step Instructions

    This is just the easiest 4-step baked lemon slice recipe!

    Note: Please scroll to the recipe card at the bottom of the post for ingredient quantities and the full detailed method.

    Step 1 - Beat

    Preheat your oven to 170 degrees celsius (fan forced), and grease and line a square baking tin.

    Place butter (that has been softened to room temperature), caster sugar and lemon zest into a large bowl.

    Beat the ingredients together until smooth and creamy.

    Butter, sugar and lemon zest in a mixing bowl

    Step 2 - Add Wet Ingredients

    Add the eggs and lemon juice and beat well to combine.

    Two eggs added to creamed butter & sugar in a bowl

    Step 3 - Add Dry Ingredients

    Fold through the baking powder and flour.

    Flour & baking powder added to wet mixture

    Mix together gently until well combined.

    Lemon slice mixture in a white bowl

    Pour the mixture into your prepared baking tin and place into the oven to bake.

    Uncooked slice mixture spread into a lined square baking tin

    Step 4 - Make The Frosting

    Prepare the lemon frosting by sifting the icing sugar into a bowl and then adding the softened butter and lemon juice.

    Icing sugar, butter and lemon juice in a bowl

    Whisk until the icing is completely smooth.

    Lemon icing mixture in a bowl with a whisk

    Once the baked slice base has cooled completely, spread the icing evenly over the slice whilst it is still in the baking tin.

    Icing spread on top of slice in a lined square baking tin

    Once the icing has set, remove the slice from the tin to cut and serve.

    Tips For Making The Best Lemon Frosting

    Follow these tips for a beautiful creamy lemon frosting:

    • Use pure icing sugar (as compared to icing sugar mixture) as it will set the frosting firmer than icing sugar mixture. A firmer icing is best when sending the slice in school lunch boxes.
    • Sift the icing sugar before using to remove any lumps (pure icing sugar tends to have more lumps than the softer icing sugar mixture so don't miss this step!)
    • Use room temperature butter.
    • If your frosting is too thick to spread, add a small amount of extra lemon juice and mix again.
    • If your frosting is too thin, add some extra sifted icing sugar.
    • Whisk the frosting until it's smooth and creamy with no lumps of butter or icing sugar remaining.
    A piece of baked lemon slice on a blue and white plate, and a cake stand blurred in the background.

    Expert Tips & FAQ's

    How do I adjust the temperature for my conventional oven?

    Temperatures given in my recipes are for fan-forced ovens. All ovens are slightly different but to bake in a conventional oven, simply increase the temperature by 10-20 degrees, and keep a close eye towards the end of the baking time to ensure the slice isn't browning too quickly.

    What happens if my frosting is either too runny or too thick?

    This can easily be fixed by adding extra icing sugar (if too thin) or extra lemon juice (if too thick). See my tips above for making the perfect lemon frosting.

    Storing & Freezing

    You can store this baked lemon slice in an airtight container at room temperature for up to 5 days, or freeze for up to 1 month. 
    I recommend keeping this baked lemon slice at room temperature so that it stays beautifully soft and moist.

    Some lemon cake on a gold fork next to the remaining piece of iced slice

    Related Recipes

    This Baked Lemon Slice is just so deliciously tangy and moist - the perfect afternoon tea recipe!

    If you find that you have a fruit bowl overflowing with lemons, these lemon recipes are always popular:

    • Lemon & Yoghurt Loaf
    • Gluten Free Lemon Cake
    • Creamy Mini Lemon Puddings
    • No Bake Lemon Cheesecake

    WANT EVEN MORE DELICIOUS RECIPES? Subscribe to my newsletter or follow along on Facebook or Instagram. And if you love baking, then please come and join my Facebook cooking club group or subscribe to my YouTube channel. 

    Squares of baked lemon slice with lemon frosting, served on a white cake stand

    Baked Lemon Slice

    The easiest and most delicious Baked Lemon Slice.... with the BEST creamy & tangy lemon frosting - this is such a quick, simple and classic slice recipe.
    5 from 36 votes
    Print Pin Rate
    Course: Slices
    Cuisine: Baking
    Prep Time: 10 minutes
    Cook Time: 20 minutes
    Total Time: 30 minutes
    Servings: 16 pieces
    Calories: 238kcal
    Author: Lucy - Bake Play Smile

    Ingredients

    • 115 g butter softened to room temperature
    • 150 g (¾ cup) caster sugar
    • lemon zest from 1 lemon
    • 2 eggs room temperature
    • lemon juice from 1 lemon
    • ½ tsp baking powder
    • 95 g (¾ cup) plain flour

    For the frosting

    • 270 g (1 ¾ cup) pure icing sugar sifted, see notes
    • 65 g butter softened to room temperature
    • 4 tbs lemon juice (extra if needed)

    Instructions

    Conventional Method

    • Preheat oven to 170 degrees celsius (fan-forced). Grease and line a 20cm x 20cm cake tin with baking paper. Set aside. 
    • Place the butter, caster sugar and lemon zest into a large bowl. Beat until smooth and creamy. 
    • Add the eggs and lemon juice and beat to combine. 
    • Fold through the baking powder and flour. 
    • Spoon the mixture into the prepared tin and bake for 20-25 minutes or until a skewer inserted into the middle comes out clean. 
    • To prepare the frosting, place the sifted icing sugar, butter and lemon juice into a bowl. Whisk until smooth and creamy. If the frosting is a little too thick, add a bit more lemon juice and whisk again. If too thin, add a little more icing sugar.
    • Spread the frosting over the cooled slice and allow to set. 

    Thermomix Method

    • Preheat oven to 170 degrees celsius (fan-forced). Grease and line a 20cm x 20cm cake tin with baking paper. Set aside. 
    • Place the butter, caster sugar and lemon zest into the Thermomix bowl. Insert the butterfly and mix for 30 seconds, Speed 4. Scrape down the sides of the bowl and repeat until smooth and creamy. 
    • Add the eggs and lemon juice and mix for 10 seconds, Speed 4, to combine. Remove the butterfly.
    • Add the baking powder and flour and mix for 10 seconds, Speed 4. Scrape down the sides and repeat for a further 5 seconds. 
    • Spoon the mixture into the prepared tin and bake for 20-25 minutes or until a skewer inserted into the middle comes out clean. 
    • To prepare the frosting, place the icing sugar, butter and lemon juice into the Thermomix bowl and mix for 20 seconds on Speed 4. Scrape down the sides of the bowl with a spatula. Mix for an extra 30 seconds, Speed 4.
    • If the frosting is a little too thick, add a bit more lemon juice and whisk again. If too thin, add a little more icing sugar.
    • Spread the frosting over the cooled slice and allow to set. 

    Notes

    RECIPE NOTES & TIPS
    • Use pure icing sugar (as compared to icing sugar mixture) as it will set the frosting firmer than icing sugar mixture. A firmer icing is best when sending the slice in school lunch boxes.
    • If your frosting is too thick to spread, add a small amount of extra lemon juice and mix again.
    • If your frosting is too thin, add some extra sifted icing sugar.
    • Storing & Freezing - store this slice in an airtight container for up to 5 days, or wrap well and freeze for up to 1 month. Allow to thaw before consuming.

    Nutrition

    Calories: 238kcal | Carbohydrates: 37g | Protein: 2g | Fat: 10g | Saturated Fat: 6g | Cholesterol: 45mg | Sodium: 89mg | Potassium: 39mg | Fiber: 1g | Sugar: 28g | Vitamin A: 310IU | Vitamin C: 1.5mg | Calcium: 14mg | Iron: 0.6mg
    Did you try this recipe?Mention @BakePlaySmileBlog or tag #BakePlaySmile!
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    Reader Interactions

    Comments

    1. natasha

      September 13, 2020 at 6:00 am

      Hi there, your recipe only says juice of one lemon. I am unsure how much lemon juice that actually is. Are you able to provide a more accurate amount? Ie. 1/4 of a cup etc. As surely the amount of liquid used will affect consistency of the mix and it may not work as well. Be too try or not cook properly. A big lemon would provide more juice than a small lemon as well. Thanks ever so much for your advice!

      Reply
      • Lucy

        September 13, 2020 at 8:12 am

        Hi Natasha, a medium sized lemon contains approximately 4 tablespoons of lemon juice. 🙂

        Reply
    2. Johanna Leorke

      September 04, 2020 at 4:09 pm

      5 stars
      Absolutely delicious, just so moist and yummy

      Reply
      • Lucy

        September 05, 2020 at 8:53 am

        Thank you!!

        Reply
    3. Mich

      May 04, 2020 at 9:54 pm

      Hello! May I know what are slices? Are these a type of cake? How do I cut them and store them? Will they crumble upon cutting? Haha, sorry for the many questions! Have never seen/eaten a slice before!

      Reply
      • Lucy

        May 05, 2020 at 8:10 am

        Hi there, slices can be cake like (this one is) or they can have a firmer biscuit/cookie based texture. You can ice this slice and then cut it once it's cooled. This particular slice may crumble a little when you cut it as it's been baked! xx

        Reply
    4. Candice

      May 01, 2020 at 5:34 pm

      Hi Lucy! Awesome recipe! Will be my first time making slice! Can I use an 8-inch circular cake tin instead? Not sure how it will affect the ‘height’ of the slice. Thank you! ☺️

      Reply
      • Lucy

        May 02, 2020 at 9:12 am

        Hi Candice, hmm you could certainly try (but yes you're right, the heigh will be different). Also make sure you grease and line it really well with overhanging baking paper so you can easily remove it!

        Reply
        • Candice

          May 02, 2020 at 11:20 pm

          Thank you!! One more question, is it possible to use icing sugar in replacement of caster sugar? Caster sugar is out of stock over here >_<
          What I have currently are icing sugar and white sugar

          Reply
          • Lucy

            May 03, 2020 at 8:56 am

            Hi Candice, I would use your white sugar xx

            Reply
    5. Shane

      December 16, 2019 at 4:55 pm

      Hi. The frosting says use icing sugar. Is that pure icing sugar, or icing sugar mixture? Also, you don't provide the non fan-forced oven temperature to preheat it to.

      Reply
      • Lucy

        December 16, 2019 at 6:40 pm

        Hi Shane - you can use either pure icing sugar or icing sugar mixture. However, I prefer using pure icing sugar as it sets the icing firmer (greta for lunch boxes or taking to an event). For non fan-forced, simply increase to 180 degrees celsius. xx

        Reply
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