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Homemade Mars Bar Slice with a chocolate rice crispy base, topped with smooth milk chocolate and pieces of Mars Bar.

Mars Bar Slice

No-bake Mars Bar Slice tray bake with crisp rice, melted Mars Bars, and a glossy milk-chocolate top - quick to make and perfect for sharing.
5 from 12 votes
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Course: Dessert, Snack
Cuisine: Scottish
Prep Time: 20 minutes
Setting Time: 2 hours
Total Time: 2 hours 30 minutes
Servings: 12 slices

INGREDIENTS
 

INSTRUCTIONS

  • Line a 20×20cm (8×8 inch) baking tin with some greaseproof paper and set aside.
  • In a large bowl, melt the butter/margarine and Mars Bars over a bain marie, or in short bursts in a microwave. Use the back of a spoon/spatula to break up the nougat of the Mars Bars, as this won't melt as well as the butter/margarine. Don't worry about lumps though - it won't be perfectly smooth.
  • Add the rice crispies to the melted ingredients and mix well, ensuring all are coated.
  • Tip into your prepared baking tin and push down with the back of a spoon/spatula, ensuring an even finish right into the corners.
  • Melt the milk chocolate over a bain-marie, or in short bursts in the microwave, before spreading it on top of your Rice Crispy base. Add a few pieces of chopped Mars Bar to decorate, if desired.
  • Place in the fridge to set for at least 2 hours, or ideally overnight. Cut into your desired portion sizes to serve.

IMPORTANT NOTE:

All my recipes are developed using a digital scale and the metric system (grams and millilitres). Cup measurements are available as a conversion but these, unfortunately, won't always be as accurate. For best results, I always recommend baking with a digital scale.

RECIPE NOTES:

Mars Bar Size: If using full-sized Mars Bars (51g), you will need a little under five Mars Bars. If you are using multi-pack Mars Bars (usually about 40g each) you will need about 6 Mars Bars.
Mars Bar vs. Milky Way: In America (and possibly other parts of the world), what we in the UK know as a Mars Bar is known as a Milky Way - which, confusingly, is something different again here in the UK. Either way, it's a nougat & caramel-centred chocolate you are looking to use for this recipe.
Storage: Keep your Mars Bar Slice in an airtight container at room temperature for up to 7 days. If your kitchen is particularly warm, you can store it in the fridge.

Substitutions:

  • Rice Crispies: Any crisped rice cereal will work here.
  • Mars Bars: You can use supermarket own-brand chocolate bars instead of branded Mars Bars.
Serving: 1slice | Calories: 211kcal | Carbohydrates: 25g | Protein: 2g | Fat: 12g | Saturated Fat: 7g | Polyunsaturated Fat: 0.4g | Monounsaturated Fat: 3g | Trans Fat: 0.4g | Cholesterol: 23mg | Sodium: 164mg | Potassium: 75mg | Fiber: 0.3g | Sugar: 15g | Vitamin A: 1022IU | Vitamin C: 7mg | Calcium: 52mg | Iron: 3mg

Nutrition information is provided as a guide and is based on automatic calculations. Actual values may vary depending on the ingredients and brands used, how the recipe is prepared, and individual portion or serving sizes.

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