Mars Bar Squares

This simple recipe for Mars Bar Squares is made with just 4 simple ingredients, and is truly decadent! Also known as Mars Bar Slice.

5 from 2 votes

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Course: Dessert

Cuisine: British, Canadian, UK

Prep Time: 15

Chilling time: 3

Total Time: 3 15

Servings: squares

Calories: 353kcal

Author: Dolly (Maritime Country Kitchen)

Equipment

8X8" baking pan 21X21cm
Parchment paper

Ingredients

▢ 4 Mars bars 52 grams each
▢ ½ cup butter
▢ 3 cups crispy rice cereal (Rice Krispies)

Topping

▢ 1 cup chocolate chips
▢ 3 tablespoons butter

US Customary - Metric

Instructions

Line an 8X8 baking pan with overlapping pieces of parchment paper, or spray lightly with cooking spray.
Unwrap the Mars bars and cut them into small pieces. Place them in a microwave-safe bowl along with ½ cup of butter.
Heat in the microwave for 1 minute, then stir well to combine. If the chocolate bars are not completely melted heat for an additional 30 seconds. Stir until the butter and chocolate mix together easily.
Add 3 cups of crisp rice cereal to the bowl and fold it in using a silicone spatula. Continue to mix it until the cereal is coated with the melted chocolate mixture.
Transfer the cereal mixture to the prepared baking pan, pressing it into the pan in an even layer.
Add 1 cup of chocolate chips and 3 tablespoons of butter to a microwave-safe bowl and heat in 30-second intervals - stirring after each one - until the chocolate and butter are completely melted together. This shouldn’t take any longer than 1-2 minutes total.
Spread the melted chocolate on top of the cereal layer in an even layer.
Allow the squares to cool at room temperature for about 20-30 minutes, then score into the desired amount of bars.
Cover with plastic wrap and place in the fridge to chill for 2-3 hours, or until set.
Run a knife through the scored lines, cutting them into bars. Serve and enjoy!

Notes

**Stovetop Method: Heat the butter and Mars bars in a double boiler or heavy-bottomed large saucepan until completely melted. Add the cereal to the melted mixture and press into an 8X8" (21X21cm) baking pan. Melt the chocolate chips and butter together in a small heavy-bottomed saucepan or double boiler, then top the squares. Chill, slice, and serve.

Notes for the UK: Also known as Mars Bar Slice, this recipe features measurements in both imperial and metric. I weighed the ingredients myself, so you can be sure the weights are accurate - just toggle below the ingredients to "metric".

Mars bars in the UK weigh 51 grams and 52 grams in Canada, so there is no significant difference.

Storage: Keep any leftover Mars Bars Squares in the fridge, as the chocolate will melt at room temperature. Stores for up to 5 days in the fridge. To freeze, wrap the bars individually and place them in freezer bags. Freeze for up to 3 months.

Nutrition