Three Ingredient Rice Bubble Bars

Now that we the new school year is well and truly upon us, it’s easy to start struggling with lunch box ideas. ย These three ingredient Rice Bubble Bars are the perfect lunchbox treat and also make a great afternoon school snack.

Three Ingredient Rice Bubble Slice
These taste much better than the store bought varieties and because you have made these yourself, you know exactly what has gone into them and can cut them into smaller portion sizes if you wish.

Rice bubble bars 1

For a treat, you can decorate these bars with 100s and 1000s or even chocolate chips, alternatively they are delicious all on their own.

Three Ingredient Rice Bubble Bars

4 from 1 vote
Print Pin Rate
Prep Time: 15 minutes
Cook Time: 2 hours
Total Time: 2 hours 15 minutes
Servings: 24
Author: Thermomix Recipes by Thermobliss


  • 75 g of butter
  • 200 g of white marshmallows
  • 6 cups of rice bubbles
  • 100 s & 1000s to decorate - optional


  • To begin, line the base and sides of a slice tin with baking paper - making sure you leave the paper hanging over the edges.
  • Place the marshmallows and butter into the thermomix bowl and cook for 1 minute on 80 degrees, speed 1 or until melted and combined. After approximately 30 seconds, use the spatula to scrape down the sides.
  • Add the rice bubbles to the bowl and mix for 1 minute 20 seconds on speed 1 Reverse until mixture has combined.
  • Pour the combined mixture into a slice tin and use a metal spoon to spread across the
  • tin and push down.
  • If decorating, sprinkle the 100s and 1000s over the top of the slice and place in the fridge for two hours or until set.
  • Remove set slice from the fridge and cut into small squares.


What was your favourite lunch box treat growing up?

Comments 12

    1. Post

      I haven’t tried freezing this one before, you could always try freezing a little piece overnight to see how it goes before freezing a big batch ๐Ÿ™‚

    1. Post
  1. Love these. First time I used quinoa puffs and kids didn’t pick the difference. Used a few extra marshmallows this time to make it stick better (pink and white) and melted for 2 mins. Also find it mixes better if you gradually add the rbs through the hole in the lid while it’s mixing, rather than all at once. Kids gobble it up!

    1. Post

      Thanks for the tips Nicola, I’m going to try that next time ๐Ÿ™‚ I’m glad the kids love them too xx

  2. Not sure if I was doing something wrong but I definitely had to increase the time and speed to mix the marshmallows and butter. In the fridge now and looks great! Thank you!

    1. Post

      Hi Jasmin, thanks for your feedback! Hmm, sometimes if the butter is straight from the fridge it can take a little longer. I hope you enjoy it ๐Ÿ™‚

  3. Pingback: Thermomix Healthy Chocolate Rice Bubble Slice - Thermobliss

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