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marshmallow rice krispie squares on a small white plate piled high on top of each other with a pink napkin around the plate

The Best Marshmallow Krispies

The Best Marshmallow Krispies. Only four ingredients and you have the most delicious treat. A huge favourite with adults and children alike.

Course snacks, treats
Cuisine American
Keyword marshmallow cakes, marshmallow krispies
Prep Time 10 minutes
Cook Time 0 minutes
Setting 1 hour
Total Time 1 hour 10 minutes
Servings 16 servings
Calories 121 kcal


  • 300 grams marshmallows
  • 50 grams unsalted butter
  • 160 grams rice krispies
  • 1 tsp vanilla extract


  1. Melt the butter in a very large saucepan and add the vanilla extract. Remove from the heat.

  2. Tip in the marshmallows and stir to melt with a spatula.

  3. Tip in the rice krispies and stir with the spatula until it is all mixed through.

  4. Empty into your tin and gently smooth with the same spatula. Don't press down too hard. Sprinkle on your sprinkles if using. Smear some soft butter on the back of a metal spoon if the rice krispie mixture is too sticky to smooth over.

  5. Chill in the fridge for at least an hour.

  6. Use a serrated knife to cut into 16 squares or the size you wish.

  7. Apply To Childhood Face

Recipe Video

Recipe Notes

  • Use the nicer flavour marshmallows if you can. Otherwise add ½ tsp of vanilla extract.
  • Use your biggest saucepan to make it easier to stir it all together. Mine is 23 cm wide and 10 cm deep.
  • Use a flat spatula to stir in the rice krispies.
  • Work quickly mixing in the rice krispies whilst the mixture is still hot.
  • Store them in an airtight container with greaseproof or baking paper in between the layers. They are best eaten within 48 hours.
  • I use an 8 " loose bottomed tin with a reusable silicone liner but you can grease the tin instead with butter/spread. You can use a tin with greater an area to fill but the krispie bars/squares will be less deep.
  • Use a serrated large knife to cut the squares.


Nutrition Facts
The Best Marshmallow Krispies
Amount Per Serving
Calories 121 Calories from Fat 27
% Daily Value*
Fat 3g5%
Saturated Fat 2g13%
Cholesterol 7mg2%
Sodium 68mg3%
Potassium 13mg0%
Carbohydrates 24g8%
Fiber 1g4%
Sugar 12g13%
Protein 1g2%
Vitamin A 743IU15%
Vitamin C 6mg7%
Calcium 1mg0%
Iron 3mg17%
* Percent Daily Values are based on a 2000 calorie diet.