Homemade LCM Bars
If LCM Bars are a regular on your kids’ lunchbox wish list, you’re going to love this easy homemade version!
Made with crunchy Rice Bubbles, gooey marshmallows and colourful M&Ms, these Homemade LCM Bars are chewy, sweet and so much fun to make.
Best of all, they’re no-bake, budget-friendly and ready in no time, making them perfect for lunchboxes, after-school snacks, birthday parties or just a fun little treat.
And if you grew up eating LCM Bars yourself, don’t be surprised if the adults start sneaking a piece too!
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Why You’ll Love These Homemade LCM Bars
Quick and easy – no oven needed and only a handful of ingredients.
Budget-friendly – make a whole batch at home rather than buying individual bars.
Perfect for lunchboxes – an easy little treat to pop into school or work lunches.
Kid-approved – chewy marshmallow, crunchy Rice Bubbles and M&Ms are always a winning combination.
Great for parties – cut them into smaller squares for an easy birthday party treat.
Easy to customise – swap the M&Ms for sprinkles or your favourite chocolate chips.
What Are LCM Bars?
LCM Bars are a popular Australian snack made with crispy puffed rice cereal held together with a sweet, chewy marshmallow mixture.
This homemade version (also known as Marshmallow Bubble Slice) gives you that same crispy, chewy texture using just a few simple supermarket ingredients.
Top Tips
Work quickly. Once the melted marshmallow mixture hits the Rice Bubbles, it starts setting fairly quickly, so have everything ready to go.
Don’t use too much pressure. Press the mixture firmly enough to hold together, but avoid really compacting it or your bars can become too hard and dense.
Add the M&Ms last. Pressing them over the top rather than stirring them through the warm marshmallow mixture helps prevent the colours from running.
Use baking paper. A sheet of baking paper over the top makes it much easier to gently press the mixture evenly into the tin without it sticking to your hands.
Variations
There are plenty of ways to have a little fun with these bars. Try mini M&Ms, colourful sprinkles, choc chips or a drizzle of melted chocolate over the top.
For birthday parties, you can also cut the slice into bite-sized squares rather than traditional bars.
Storage
Store Homemade LCM Bars in an airtight container at room temperature. Keep them somewhere cool and away from direct sunlight so the chocolate doesn’t melt.
For lunchboxes, you can cut the slice into individual bars and store them ready to grab and go during the week.
Frequently Asked Questions
Can I make LCM Bars ahead of time?
Absolutely. They’re a great make-ahead lunchbox treat and can be prepared in advance and stored in an airtight container.
Why are my homemade LCM Bars hard?
This can happen if the marshmallow mixture is heated for too long or if the Rice Bubble mixture is packed too firmly into the tin. Melt the marshmallows gently over low heat and press the mixture into the tin without compacting it too much.
Can kids help make these?
Definitely! Once an adult has taken care of melting the marshmallows, kids can help stir, press the mixture into the tin and, of course, add the M&Ms.
Can I make these without M&Ms?
Yes. Leave them plain or decorate with sprinkles, mini choc chips or a drizzle of melted chocolate instead.
Marshmallow Bubble Slice (LCM)
Why buy LCM bars when you can make them at home? This easy, no-bake Marshmallow Bubble Slice is chewy, sweet, and budget-friendly—perfect for lunchboxes, parties, or an after-school treat!
Ingredients
- 4 cups Rice Bubbles
- 1 pack mini M&Ms
- 75g unsalted butter, cubed
- 250g white marshmallows (Pascal or similar)
- 1 teaspoon vanilla extract
- Sprinkles (optional)
Instructions
- Line a slice tray with baking paper, leaving an overhang for easy removal.
- In a medium saucepan over low heat, melt the butter and marshmallows, stirring continuously until smooth. Stir in vanilla.
- Allow the marshmallow mixture to cool slightly (if it’s too hot, it will melt the M&Ms).
- In a large mixing bowl, combine Rice Bubbles and M&Ms. Pour the melted marshmallow mixture over the top and quickly stir to coat.
- Press the mixture into the prepared tray, smoothing the top with a piece of baking paper.
- Sprinkle with extra M&Ms or sprinkles if desired.
- Refrigerate for at least 2 hours, or until firm.
- Slice into bars and enjoy!
Notes
Tip: For the cleanest slices, use a sharp knife and wipe it clean between cuts.
Nutrition Facts
Calories
256Fat
4 gSat. Fat
3 gCarbs
50 gFiber
1 gNet carbs
50 gSugar
10 gProtein
4 gSodium
15 mgCholesterol
10 mgThe nutritional information provided is computer generated and is only an estimate. This data is provided as a courtesy for informational purposes only.
