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    Home » Recipes » Bars Brownies & Slices » Peanut Butter Brownies

    Peanut Butter Brownies

    Published: Oct 21, 2022 by Lucy · This post may contain affiliate links · Leave a Comment

    Jump to Recipe
    Squares of a brownie slice with peanut butter swirled through.

    Calling all peanut butter lovers! If you love peanut butter and brownies, then you're going to love this recipe. These Peanut Butter Brownies are rich, fudgy, chocolatey and absolutely delicious.

    Plus they'll be ready to eat in just 35 minutes - and require just one bowl to prepare!

    Peanut butter brownies cut into squares.

    These peanut butter brownies are SO easy to make (perfect for beginners!) - all you need is a few basic ingredients that you may already have in your kitchen and one bowl!

    So why not give them a try? You won't be disappointed!

    Just like my M&M Brownies and my Microwave Chocolate Brownies, these brownies could not be any easier to make and will satisfy any sweet tooth!

    Why You're Going To Love This Recipe

    • Easy To Make - this recipe is really simple and doesn't require any fancy ingredients or equipment.
    • Fudgy Texture - these fudgy brownies are nice and rich with a dense texture that's just perfect.
    • Loaded With Peanut Butter Flavour - there's peanut butter in the brownie batter, as well as a layer of peanut butter swirl running through the centre. Double peanut butter deliciousness!
    • Ready To Eat In 35 Minutes - craving something sweet? These peanut butter brownies take no time at all to prepare and cook!
    • Conventional and Thermomix - you will find both methods in the recipe card at the bottom of the post.
    Two fudgy chocolate  and peanut butter slices stacked.

    What You Need

    Just a handful of basic ingredients is all you need!

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

    Ingredients to make a fudgy slice in bowls.
    • Butter - you can use either salted butter or unsalted for this recipe.
    • Peanut Butter - smooth and creamy peanut butter works best for this recipe. You can use all natural peanut butter if you prefer.
    • Caster Sugar - also known as superfine sugar, it dissolves easily when creamed with butter.
    • Cocoa Powder - choose a quality cocoa powder such as Cadbury, Hershey's or Nestle brand. Either unsweetened cocoa powder or sweetened is fine.
    • Vanilla Extract - you can also use vanilla bean paste or vanilla essence.
    • Eggs - ensure eggs are at room temperature.
    • Plain Flour - sift the flour before using.

    Equipment Required

    You will need a microwave or stovetop to melt the butter (or a Thermomix machine).

    You'll also need a mixing bowl and spoon, plus a 20cm (8 inch) square baking tin.

    Step By Step Instructions

    Just 4 simple steps and 5 minutes prep time is all it takes to prepare moist peanut butter brownies.

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

    Step 1 - Prepare The Peanut Butter Mix

    Preheat oven to 160 degrees celsius (fan-forced) and line a 20cm square tin with baking paper. Set aside.

    Butter and peanut butter in a glass bowl.

    Place the butter and peanut butter into a microwave-safe bowl. Heat for 1 minute to melt.

    If using a Thermomix - Place the butter and peanut butter into the Thermomix bowl. Melt for 3 minutes at 80 degrees, Speed 2.

    Cocoa added to butter mixture in a bowl.

    Step 2 - Add More Ingredients

    Add the caster sugar and sifted cocoa powder and stir. Heat in the microwave on 30-second bursts (50% power) until the sugar has dissolved and ingredients combined - stirring each time.

    A thick chocolate mixture in a glass bowl.

    If using a Thermomix - Add the caster sugar and cocoa powder and mix for 10 seconds on Speed 4. Scrape down the sides of the bowl and repeat for a further 10 seconds.

    Allow to cool slightly.

    Eggs added to chocolate mixrure in a bowl.

    Add the vanilla extract and the eggs and whisk until combined.

    If using a Thermomix - Add the vanilla extract and the eggs and mix for 10 seconds on Reverse, Speed 4. Scrape down the sides and repeat.

    Flour sifted over brownie mixture in a glass bowl.

    Step 3 - Add The Flour

    Sift the plain flour into the bowl and gently fold through.

    If using a Thermomix - Add the plain flour and mix for 5 seconds on Speed 4. Scrape the sides of the bowl and repeat.

    Peanut butter brownie mix in a baking pan.

    Step 4 - Bake The Brownies

    Pour the peanut butter brownie mixture into the prepared tin. Dollop the extra peanut butter over the top of the brownie. Use a knife or a skewer to swirl the peanut butter through the brownie batter.

    Peanut butter swirled through the top of a chocolate slice.

    Bake for 25-30 minutes or until cooked through.

    Leave in the tin to cool completely.

    Expert Tips

    • For extra peanut butter flavour, add some Reese's Pieces or mini peanut butter cups to the batter.
    • For an extra indulgent treat, serve these peanut butter brownies warm with a scoop of vanilla ice cream.
    • For best results use store-bought smooth and creamy peanut butter.
    • Don't overcook the brownies - they should be dense and fudgy.
    • Store in an airtight container at room temperature for up to 4 days or in an airtight container in the fridge for up to 5 days.
    • Freeze in an airtight container for up to 3 months.
    Squares of peanut butter brownies placed on baking paper.

    FAQ's

    What makes a brownie fudgy?

    The fat-to-flour ratio is higher in fudgy brownies than in 'cakey' ones. In this recipe the 'fat' content comes from the butter, cocoa and peanut butter. A cakey batch uses extra flour and baking powder as the leavening agent. My peanut butter brownies contain no leavening agent, meaning that the brownies stay fudgy and dense!

    Can I make peanut butter brownies in a Thermomix?

    Absolutely! You can make my peanut butter brownies in a Thermomix or in a mixing bowl (both methods are included below).

    How do I know if my peanut butter brownies are cooked?

    The top of the brownies will be flakey and set. Insert a skewer into the centre of the brownie. If it comes out with moist crumbs on it (not wet) then it's ready. The brownie will continue to cook while cooling. Do NOT overcook the brownies or they will lose their fudgy texture.

    A forkful of a dense chocolate brownie half eaten.

    Related Recipes

    These delicious peanut butter brownies are sure to be a hit with the whole family! If you're looking for more peanut butter treats, you'll love these!

    Here are a few of my most popular peanut butter recipes:

    • These Raw & Guilt-Free Peanut Butter Brownie Bliss Balls are the perfect healthy treat... even though they taste super naughty! Includes a simple step by step recipe video!
      Peanut Butter Protein Balls
    • Pieces of slice topped with white chocolate peanut topping.
      Peanut Butter Slice | 5 Ingredients
    • A plate of cookies with colourful M&Ms and chocolate chips.
      Peanut Butter Cookies with M&Ms
    • A simple 4 ingredient Chocolate Easter Birds Nests recipe made with Changs fried noodes, melted chocolate, peanut butter and mini Easter eggs.
      Easter Chocolate Birds Nests

    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. 

    Overhead shot of pieces of brownies with peanut butter swirled through.

    Peanut Butter Brownies

    Calling all peanut butter lovers! If you love peanut butter and brownies, then you're going to love this recipe. These Peanut Butter Brownies are rich, fudgy, chocolatey and absolutely delicious.
    5 from 6 votes
    Print Pin Rate
    Course: Dessert, Snack
    Cuisine: brownies, Slices
    Prep Time: 5 minutes minutes
    Cook Time: 30 minutes minutes
    0 minutes minutes
    Total Time: 35 minutes minutes
    Servings: 20 serves
    Calories: 140kcal
    Author: Lucy - Bake Play Smile

    Ingredients

    • 150 g butter
    • 60 g (¼ cup) smooth and creamy peanut butter
    • 275 g (1 ¼ cups) caster sugar see notes
    • 75 g (¾ cup) cocoa powder
    • 2 tsp vanilla extract or vanilla bean paste
    • 3 eggs room temperature
    • 75 g (½ cup) plain flour
    • 120 g (½ cup) extra smooth and creamy peanut butter
    Prevent your screen from going dark

    Instructions

    • Preheat oven to 160 degrees celsius (fan-forced) and line a 20cm square tin with baking paper. Set aside.
    • Place the butter and peanut butter into a microwave-safe bowl. Heat for 1 minute.
      If using a Thermomix - Place the butter and peanut butter into the Thermomix bowl. Melt for 3 minutes on 80 degrees, Speed 2.
    • Add the caster sugar and sifted cocoa powder and stir. Heat in the microwave on 30 second bursts (50% power) until sugar dissolved and ingredients combined - stirring each time.
      If using a Thermomix - Add the caster sugar and cocoa powder and mix for 10 seconds on Speed 4. Scrape down the sides of the bowl and repeat for a further 10 seconds.
    • Allow to cool slightly.
    • Add the vanilla extract and the eggs and whisk until combined.
      If using a Thermomix - Add the vanilla extract and the eggs and mix for 10 seconds on Reverse, Speed 4. Scrape down the sides and repeat.
    • Sift the plain flour into the bowl and gently fold through.
      If using a Thermomix - Add the plain flour and mix for 5 seconds on Speed 4. Scrape the sides of the bowl and repeat.
    • Pour the brownie mixture into the prepared tin. Dollop the extra peanut butter over the top of the brownie. Use a knife or a skewer to swirl the peanut butter through the brownie batter.
    • Bake for 25-30 minutes or until cooked through.
      Leave in the tin to cool completely.

    Notes

    RECIPE NOTES & TIPS:
    • For fudgy/moist brownies, cook for 25-30 minutes and test with a toothpick which should come out with moist (but not wet) crumbs on it. The top should be flaky and set. 
    • For best results use store-bought smooth and creamy peanut butter.
    • For extra peanut butter flavour, add some Reese's Pieces or mini peanut butter cups to the batter.
    • For an extra indulgent treat, serve the brownies warm with a scoop of vanilla ice cream.
    • Storage - store brownies in an airtight container at room temperature for up to 4 days or in the fridge for up to 5 days.
    • Freezing - freeze in an airtight container in the freezer for up to 3 months. To thaw, leave the slices in a container in the fridge overnight, or sit them at room temperature for 1-2 hours. 

    Nutrition

    Calories: 140kcal | Carbohydrates: 19g | Protein: 2g | Fat: 7g | Saturated Fat: 4g | Cholesterol: 41mg | Sodium: 64mg | Potassium: 72mg | Fiber: 1g | Sugar: 14g | Vitamin A: 223IU | Calcium: 11mg | Iron: 1mg
    Did you try this recipe?Mention @BakePlaySmileBlog or tag #BakePlaySmile!
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    I’m Lucy! A mum, a wife, a food blogger and a lover of all things to do with food! I love creating delicious, no-fuss Thermomix and conventional recipes the whole family will love. Classic baking favourites, lunch box snacks, quick and easy family dinners and more!

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