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    Home » All Posts » Family » Lunchbox Recipes » Sweet Thermomix Lunchbox Recipes » Thermomix Rice Bubble Bars

    Published: Feb 12, 2015 · Modified: Sep 12, 2022 by Lauren Matheson ·

    Thermomix Rice Bubble Bars

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    Jump to Recipe Print Recipe

    Our 3 ingredient Thermomix Rice Bubble Bars taste just like store-bought LCM bars! Made from rice bubbles, marshmallows and butter and prepped in just 15 minutes... don't forget to add sprinkles for a fun (and kid-approved touch!).

    Sprinkles on top of rice krispie slice.

    When you have hungry little mouths to feed, quick and easy recipes are just what you need!

    And it doesn't get any easier than these Thermomix Rice Bubble Bars. Not only do they taste delicious, they're perfect for school lunchboxes!

    An all-time favourite with the kids!

    Why You're Going To Love This Recipe

    If your kids love store-bought LCM bars, they'll love the homemade version too!

    • 3 Ingredients - Made from just rice bubbles, marshmallows and butter (plus optional sprinkles!), these Thermomix Rice Bubble Bars are perfect for last-minute snacks.
    • 15 Minutes Prep Time - So quick and easy to make! Plus the kids will love helping with this recipe (and licking the spoon!).
    • Perfect For Lunch Boxes - These bars hold their shape in lunchboxes and stay perfectly crunchy all day long.
    • Freezer-Friendly - Pop any leftovers in the freezer for 'grab and go' snacks. You can place pieces of the frozen slice directly into lunchboxes and they will have defrosted by recess time.
    Puff rice and marshmallow slice.

    What You Need

    Just 3 Ingredients!!!

    That's right... just 3 ingredients (plus sprinkles if you want a colourful pop to the slice!).

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

    The ingredients for rice bubble bars.
    • Rice Bubbles - also known as Rice Krispies. You can use any brand (or home-brand) puffed rice you like.
    • Marshmallows - if you want your Thermomix Rice Bubble Bars to look just like LCM bars, then use only white marshmallows. If you're not fussed with the look, you ca use a combo of white and pink marshmallows. I generally use the Pascall's brand of marshmallows.
    • Butter - salted or unsalted is fine to use.
    • Optional - sprinkles or 100s and 1000s give the slice a fun, bright pop of colour that the kids love.

    Step By Step Instructions

    It is SO quick and easy to make our Thermomix Rice Bubble Bars!

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

    Step 1 - Melt

    Place the marshmallows and butter into the Thermomix bowl.

    Marshmallows and butter in a stainless jug.

    Melt until smooth (a few small lumps of marshmallow are ok!).

    Melted marshmallows and butter in a Thermomix.

    Step 2 - Mix

    Add the rice bubbles to the Thermomix bowl and mix until all of the rice bubbles are completely and combined with the marshmallow mixture.

    Note: you will need to insert the Thermomix spatula through the MC hole to help mix.

    Rice bubble slice mixture in a Thermomix.

    Step 3 - Chill

    Press the mixture VERY firmly into a greased and lined baking tin.

    Add sprinkles or 100s and 1000s (optional).

    Chill for 2 hours or until set. Use a sharp knife to cut into small pieces.

    Spinkles on top of rice bubble slice.

    Expert Tips

    • You can use a mixture of pink and white marshmallows if you prefer.
    • Use regular sized marshmallows (like Pascalls brand).
    • Use a new box of rice bubbles (to avoid stale rice bubbles).
    • Insert the Thermomix spatula through the MC hole and stir to to help mix the rice bubbles through the marshmallow mixture. 
    • Press the mixture VERY firmly into the slice tin. Use the back of a large spoon and press down firmly.
    • Store the slice in the fridge for up to 1 week (keeping it in the fridge ensures it stays crunchy!)
    • Freeze for up to 3 months. 
    Rice bubble slice with sprinkles.

    FAQs

    What sized slice tin should I use?

    We recommend using a standard sized rectangular slice tin (18 X 28cm). Ensure it is greased and lined with baking paper before adding the mixture.

    How can I make sure all of the mixture has combined?

    It's important to insert your Thermomix spatula through the MC hole when the rice bubbles are being mixed through the marshmallow mixture. Use the spatula to help combine while the blades are turning.

    Why do I have to use the REVERSE function when the rice bubbles have been added?

    Using the REVERSE function will ensure that the rice bubbles are mixed gently rather than crushed!

    Sprinkles on top of rice krispie slice.

    Related Recipes

    Browse some of our most popular lunch box slices here!

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      Thermomix WeetBix Slice
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    Thermomix Lunch Box Cookbooks

    For more great lunch box recipes, check out our Thermomix Lunch Box Bundle of hardcopy cookbooks!

    The bundle includes:

    • Thermomix Lunch Box
    • Thermomix Kids Snacks Volume 1
    • Thermomix Kids Snacks Volume 2

    Check out the bundle here!

    Front Covers of Kid Snacks Volume 1 and 2 plus lunch box snacks book
    Sprinkles on top of rice krispie slice.

    Three Ingredient Rice Bubble Bars

    Our 3 ingredient Thermomix Rice Bubble Bars taste just like store-bought LCM bars! Made from rice bubbles, marshmallows and butter and prepped in just 15 minutes... don't forget to add sprinkles for a fun (and kid-approved touch!).
    5 from 6 votes
    Print Pin Rate
    Course: Snacks
    Cuisine: Australian
    Prep Time: 15 minutes
    Cook Time: 2 hours
    Total Time: 2 hours 15 minutes
    Servings: 24 serves
    Calories: 81kcal
    Author: Lucy & Lauren
    Cost: $5

    Equipment

    • Thermomix

    Ingredients

    • 75 g butter
    • 200 g white marshmallows see notes
    • 200 g rice bubbles or any puffed rice (approx 6 cups)
    • 100s & 1000s to decorate, optional

    Instructions

    • Line the base and sides of an 18 X 28cm rectangular slice tin with baking paper - leave the baking paper hanging over the sides.
    • Place the marshmallows and butter into the Thermomix bowl and cook for 4 minutes, 80 degrees, Speed 1 or until melted and combined. After approximately 2 minutes, use the spatula to scrape down the sides.
    • Add the rice bubbles to the bowl and mix for 1 minute 20 seconds, Speed 1, Reverse, or until mixture has combined. Use the spatula to help mix.
    • Pour the mixture into the prepared slice tin and use the flat side of a large spoon to spread across the tin and push down very firmly.
    • If decorating, sprinkle the 100s and 1000s over the top of the slice.
      Place in the fridge for two hours or until set.
    • Remove the slice from the fridge and cut into pieces.

    Notes

    RECIPE NOTES & TIPS
    • You can use a mixture of pink and white marshmallows if you prefer.
    • Use regular sized marshmallows (like Pascalls brand)
    • Use a new box of rice bubbles (to avoid stale rice bubbles)
    • Store the slice in the fridge for up to 1 week (keeping it in the fridge ensures it stays crunchy!)
    • Insert the Thermomix spatula through the MC hole and stir to to help mix the rice bubbles through the marshmallow mixture. 
    • Press the mixture VERY firmly into the slice tin. Use the back of a large spoon and press down firmly.
    • Freeze for up to 3 months. 

    Nutrition

    Calories: 81kcal | Carbohydrates: 14g | Protein: 1g | Fat: 3g | Saturated Fat: 2g | Polyunsaturated Fat: 0.1g | Monounsaturated Fat: 1g | Trans Fat: 0.1g | Cholesterol: 7mg | Sodium: 27mg | Potassium: 11mg | Fiber: 0.1g | Sugar: 5g | Vitamin A: 78IU | Calcium: 2mg | Iron: 0.3mg
    Tried this Recipe? Share it Today!Mention @Thermobliss or tag #Thermobliss!

    What was your favourite lunch box treat growing up?

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    Reader Interactions

    Comments

    1. Alison says

      May 16, 2020 at 6:38 pm

      5 stars
      Awesome. Kids loved them.

      Reply
    2. Melissa says

      November 06, 2019 at 8:20 pm

      Can these be used in a lunch box.

      Reply
      • Lucy says

        November 07, 2019 at 6:15 am

        Hi Melissa, they are best when kept refrigerated as they do tend to crumble when they warm up!

        Reply
    3. Jasmin says

      September 17, 2018 at 8:16 pm

      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!

      Reply
      • Lauren Matheson says

        September 23, 2018 at 6:08 pm

        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 🙂

        Reply
      • Stavey says

        September 29, 2021 at 2:01 pm

        Me too! I had to do the melting process 4 times.

        Reply
    4. Nicola Clifford says

      May 07, 2018 at 2:14 pm

      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!

      Reply
      • Lauren Matheson says

        May 13, 2018 at 5:43 pm

        Thanks for the tips Nicola, I'm going to try that next time 🙂 I'm glad the kids love them too xx

        Reply
    5. Rebecca says

      November 21, 2016 at 8:29 am

      How long do these last for please?

      Reply
      • Lauren says

        November 29, 2016 at 6:26 pm

        I've kept them for up to a week in an airtight container.

        Reply
    6. Jussi says

      November 20, 2016 at 6:25 pm

      Can these be suitably frozen?

      Reply
      • Lauren says

        November 21, 2016 at 6:23 am

        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 🙂

        Reply
        • michelle says

          December 25, 2017 at 6:53 pm

          I freeze them all the time. Still delicious!
          x

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    Hi, We're Lauren and Lucy! We're two mums who love to cook and want to show you how easy it is to make delicious family meals, baking treats and lunch box snacks in your Thermomix..

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