Homemade LCM Bars in the Thermomix

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LCM Bars are sticky and sweet, made by coating rice bubbles in marshmallows and white chocolate. They’re a sweet treat the kids will love!

Thermomix LCM Bars
Thermomix LCM Bars

I know I’ve been sharing a lot of lunchbox recipes lately but I’m really trying to give my children some variety so I’m trying out lots of new ideas. Hence the Homemade Le-Snak the cute Baby Bell Cheese Lady Birds and my Inari Sushi Pockets.

These homemade LCM bars have been another huge success. I only give my children commercially prepared LCM bars occasionally because they’re expensive and full of chemicals and preservatives.

I justify the sugar by telling myself at least they are having rice bubbles which are fortified with vitamins and minerals. Now that I have discovered how easy the homemade version of LCMs is to make, I know I will never buy the commercial variety again.

Marshmallow Rice Bubble Slice LR
Marshmallow Rice Bubble Slice LR

LCM Bar Gets Children’s Approval

When my daughter tried the bars she said they were exactly the same as the bought LCM’s. That was a surprise to me because usually, the kids object to anything homemade.

LCM Ingredients

  • I like to use salted butter and vanilla as you get that delicious “sweet and salty” flavour.
  • Decorate the bars with melted chocolate and use the chocolate to “glue” on the mini smarties.
  • The marshmallows can be any colour depending on what you would like the finished colour to be.

I decided to decorate these bars with melted chocolate and mini smarties to give them extra lunchbox appeal. However, they’re definitely classified as “sometimes food” at best.

Lunchbox LCM Bar
Lunchbox LCM Bar

Thermomix LCM Bar Variations

There are so many possible variations to this recipe.

Next time I make these I’m going to vary the ingredients and add some nuts and dried cranberries.

  • Substitute rice bubbles for Cocoa Pops and top with a milk chocolate drizzle and chopped nuts.
  • Use white chocolate marshmallows and stir through cranberries and pistachio nuts. Top with white chocolate and garnish with crushed pistachios.
LCM Lunchbox Bars
LCM Lunchbox Bars

Watchpoint & Tips

  1. The mixture will be really sticky but it doesn’t tend to stick to a plastic spatula.
  2. Press the LCM bar firmly into the tin so it is compressed and solid.
  3. LCM bars are best stored in the fridge.
  4. For a more sturdy bar add a thin layer of chocolate all the way over the top of the slice.

The LCM bars are not exactly health food. But, on a positive note, at least I know what ingredients are in them, and the kids will love them!

On a positive note,  at least I know what ingredients are in them. Next time I make these I’m going to vary the ingredients and add some nuts and dried cranberries. They still won’t really be healthy but I think the flavour would be fabulous.

Thermomix LCM Marshmallow Bars LR
Thermomix LCM Marshmallow Bars LR

Initially, I used to make these bars on the stove but the Thermomix makes everything so much easier. If you’ve tried these by hand before and cursed you will be pleasantly surprised at how easy the Thermomix makes the process.


Can I freeze these bars?

Yes, absolutely, you can even eat them frozen!

How should I store the LCM bars?

Store the bars in an airtight container in the fridge or freezer.

How long will the bars keep?

The bars will keep a week or two in the fridge and more than a month in the freezer.

Can I use mini marshmallows?

Yes, as long as the same quantity is used they will work fine.

LCM Bar - Pin for Later
LCM Bar – Pin for Later

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LCM Bar with Smarties

Thermomix LCM Bars

Julie Carlyle
A quick and easy alternative to the commercially prepared LCM bar.
5 from 5 votes
Prep Time 10 mins
Total Time 10 mins
Course Lunchbox, Snack
Cuisine American, Australian
Servings 12 bars
Calories 167 kcal



  • 5 cups rice bubbles
  • 100 gm butter
  • 200 gm pink and white marshmallows
  • 1 tsp vanilla paste
  • 50 gm white chocolate
  • 2 Tbs coloured chocolate buttons


  • Prepare a slice tin with baking paper.
  • Place butter, marshmallow and vanilla in TM bowl. Melt 5 min/90 degrees/Speed 2.
    100 gm butter, 200 gm pink and white marshmallows, 1 tsp vanilla paste
  • Add rice bubbles to the marshmallow. Combine 30 sec/Speed 2 (Reverse blade)
    5 cups rice bubbles
  • Pour the marshmallow mixture into the prepared slice tray. Flatten the slice down with a plastic spatula.
  • Melt the chocolate in a microwave for 50 sec. Stir then heat again for 20 seconds.
    50 gm white chocolate
  • Drizzle the LCM slice with white chocolate and top with the colour chocolate buttons. 
    2 Tbs coloured chocolate buttons
  • Refrigerate 2-3 hours or until set.
  •  Slice into bars.


Keep LCM bars refrigerated until required.


Calories: 167kcalCarbohydrates: 23gProtein: 1gFat: 8gSaturated Fat: 5gPolyunsaturated Fat: 0.3gMonounsaturated Fat: 2gTrans Fat: 0.3gCholesterol: 19mgSodium: 71mgPotassium: 24mgFiber: 0.1gSugar: 12gVitamin A: 210IUVitamin C: 0.02mgCalcium: 11mgIron: 0.3mg
Keyword Chocolate, Kids Snack, Lunchbox, rice bubbles, sweet, Sweet snack
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9 thoughts on “Homemade LCM Bars in the Thermomix”

  1. Crystal says:

    Looks great,
    How long will they keep in the fridge?

    1. Julie Carlyle says:

      Hi Crystal
      There is nothing that would go off in this recipe so they can be kept for quite a while. I would say 2 weeks. The only concern would be the rice bubbles becoming less crisp.

  2. Stephanie@ApplesforCJ says:

    5 stars
    What a great idea to make these at home since you can control the ingredients. Reminds me of rice krispy treats I used to eat. Love the idea of adding fruit and nuts for a healthier version.

    1. Julie says:

      Thanks Stephanie ????

  3. Sarah @ Champagne Tastes says:

    5 stars
    I’ve never used a thermomix (and I’m actually not completely sure what they are???).. but these bars look delicious! I’ll have to look up thermomix.. it sounds so amazing!!!

  4. Amanda says:

    5 stars
    I have never heard of Thermomix. The recipe sounds good, but I’m just not sure how this translates if you don’t have this machine.

    1. Julie says:

      Hi Amanda, The Thermomix has just arrived in the US so you will undoubtedly be noticing it soon. The machine mixes, cooks, steams, food processes, kneads etc.

  5. Pam Greer says:

    5 stars
    Those look so good!

  6. Sara | Belly Rumbles says:

    5 stars
    They look really great and so simple to make in the Thermomix. Love the drizzle of white chocolate over the top of them as well, so pretty.

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