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A stack of 3 pieces of marshmallow slice with puffed rice.

Rice Bubble Marshmallow Slice

Sweet, creamy and crunchy Rice Bubble Marshmallow Slice is made using only 3 ingredients - rice bubbles (or rice krispies), marshmallows and butter - and takes just 5 minutes to prepare.
5 from 14 votes
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Course: lunch box snacks
Cuisine: Australian recipe, no bake slice
Prep Time: 5 minutes
Chilling Time: 2 hours
Total Time: 2 hours 5 minutes
Servings: 20 serves
Calories: 285kcal
Cost: $5

Equipment

  • Mixing bowl and spoon (or Thermomix)
  • Microwave, stove-top or Thermomix
  • Rectangular slice tin 18cm x 28cm (7 x 11 inches)

Ingredients

  • 200 g marshmallows see notes
  • 75 g butter
  • 165 g (5 cups) rice bubbles or any puffed rice
  • 100s and 1000s/sprinkles to decorate, optional

Instructions

  • Line the base and sides of an 18cm x 28cm (7 x 11 inches) rectangular slice with baking paper and set aside.
  • Place the marshmallows and butter into a large microwave safe bowl. Melt in the microwave on 50% power for 2 minutes (or until just melted), stirring every 30 seconds.
    If using a Thermomix: Cook the marshmallows and butter for 4 minutes, 80 degrees, Speed 1 (scrape down the sides of the bowl after 2 minutes).
  • Add the rice bubbles to the marshmallow mixture and stir until all of the rice bubbles have been coated in the marshmallows.
    If using a Thermomix: Add the rice bubbles to the bowl and mix for 1 minute 30 seconds, Speed 1, Reverse (using the spatula to help mix).
  • Press the mixture into the prepared tin and sprinkle with 100s and 1000s.
  • Chill in the fridge for a minimum of 2 hours.

Notes

RECIPE NOTES & TIPS
  • Marshmallow size - use regular-sized marshmallows (like Pascall's brand) as they melt easily than jumbo or mini marshmallows.
  • Marshmallow colour - I like to use white marshmallows, however, you can use a combination of pink and white if you prefer. Note: if you use pink and white marshmallows, the slice will have a slight pink colour to it.
  • Use a new box of Rice Bubbles - it's important to use a brand new (unopened) box of rice bubbles. Using rice bubbles that have been sitting opened in the pantry may not be as crispy and fresh and lead to a stale tasting rice bubble and marshmallow slice.
  • Brand of puffed rice - while you can use any brand (or home brand) puffed rice that you like, I find that the Kellogg's brand of rice bubbles gives the crunchiest and best tasting result.
  • Press the mixture firmly into the tin - use the back of a spoon to press the mixture very firmly into the baking tin. This will ensure the slice stays together when cutting.
  • Storing - store the rice bubbles slice in an airtight container for up to one week. Storing the marshmallow rice krispies in the fridge keeps them deliciously crunchy.
  • Freeze - freeze in an airtight container for up to 3 months. Allow to defrost in the fridge before consuming.

Nutrition

Calories: 285kcal | Carbohydrates: 60g | Protein: 4g | Fat: 4g | Saturated Fat: 2g | Polyunsaturated Fat: 0.3g | Monounsaturated Fat: 1g | Trans Fat: 0.1g | Cholesterol: 8mg | Sodium: 35mg | Potassium: 70mg | Fiber: 1g | Sugar: 6g | Vitamin A: 94IU | Calcium: 7mg | Iron: 2mg