Mars Bar Crispy Squares!

A Yummy, Marshmallowy, Mars-Bar-y twist on Rice Crispy Cakes – Perfect treat to make with your kids, or even yourself if you fancy!


I have made many a tray bake recipe in my time on this blog, and they’re all delicious – as well as many cupcake recipes and so on! However, I realised that none of these are really suited for ‘kids baking’ or would be what some would consider child friendly as they use mixers and such. I have some regular readers that I know bake with their children, but I have had requests for child friendly recipes – so I hope this suits! This recipe does require a pan and heating, but they’re super duper easy to make, and they’ll go down a treat!

I love Mars Bars, evident by my Mars Bar Chocolate Mousse recipe, but these are simply delightful. When I was little, Rice Krispie cakes were an absolute must at a bake sale, or at a party – and they still are now!


These are chewy, crunchy, sweet, and soft all in one – I love to drench by crispy squares in chocolate, and add even more chocolate with all the different sprinkles – how can you resist?! They’re so easy and tasty to make! Also – these went down an absolute storm at where my parents work – which is in education, will all adults being the taste testers and everyone LOVED them! Some people saying stuff like “takes me back to my childhood” which is ideal!

I really hope you guys like these, and that if you make them with your kids – that they like them too!


This recipe makes 16-20 squares!


– 150g Mars Bars, chopped up
– 200g Mini Marshmallows
– 50g Unsalted Butter
– 225g Rice Krispies/Cocoa Pops
– 250g White Chocolate
– Chocolate Sprinkles



1) Line a 9x9inch square tray with parchment paper and leave to the side.

2) In a medium sized pan, add your small mars bar chunks, mini marshmallows, and butter – heat on a low heat, stiring frequently, until the mixture has melted. At first it may look lumpy, but after a while, and a bit of beating it’ll be smooth.

3) In a large bowl, pour your Rice Krispies/Cocoa Pops and pour the smooth melted mixture on top – mix together until all of the Rice Krispies are covered evenly – this can take a bit of welly but its worth it!

4) Press down into your tray evenly and leave to set – can take 3-4 hours. The mixture is very sticky, so you may want to use gloves, or the back of a spatula!

5) Once set, cut the pieces into squares, drizzle over some melted White Chocolate, and sprinkle with little chocolatey treats! Heaven!


Tips and Ideas

This is a delicious treat that you can make with your kids – I like using mars bars, as they were a favourite treat of mine when I was little, but if you don’t like them or can’t get them then use 250g Mini Marshmallows, and 100g Chocolate Chips!

These last 2-3days in an airtight container! And you can make them into individual crispy cakes just as easily if you prefer! 🙂



You can find my other Tray Bake Recipes on my Recipes Page!

You can find me on:

J x

© Jane’s Patisserie. All images & content are copyright protected. Do not use my images without prior permission. If you want to republish this recipe, please re-write the recipe in your own words and credit me, or link back to this post for the recipe.



  1. Can’t wait to start making some of your recipes, they look amazing. Just a shame you don’t seem to offer printable versions of the recipes you post as it means having to work out which pages to print without printing about 12 pages, and sometimes parts of the recipe gets cut off meaning I have to copy and paste into Word to print them.

    1. If you noticed on all my recent recipes, there are printable versions. I have over 350 recipes on my website, so it takes time. I have to now pay for a part of my website to be able to do the printable versions, so you’ll just have to be patient.

  2. I love rice krispie squares. The best ones I ever managed to make had peanut butter in them and they were irresistible!

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