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+ servings
A mars bar next to stacked mars bar squares

Best Ever Mars Bar Slice

Course: Sweet treats
Cuisine: British
Keyword: Mars Bar Recipe, Mars Bar Slice
Skill level: Easy
Prep Time: 10 minutes
Total Time: 10 minutes
Servings: 20 Squares
Calories: 175kcal
Author: Amy Treasure
Your go to Mars Bar Slice recipe. Just 5 simple, everyday ingredients make the sweet treat your entire family will love!
Print Recipe


  • 1/4 cup Butter 55g, unsalted
  • 2 tbsp corn/golden syrup
  • 8 Mars Bars
  • 3 cups Rice Bubbles Rice Pops, Rice Krispies
  • 8.5 ounces Milk Chocolate 250g, I use Cadburys


  • In a saucepan, melt the butter and corn/golden syrup.
  • Chop 4 mars bars and add them to the saucepan to melt.
  • Once melted add Rice Bubbles and mix to combine.
  • Chop a further 4 mars bars and add them to the Rice Bubbles mixture, folding to combine.
  • Transfer the mixture to a lined baking pan and use the back of a wooden spoon to flatten.
  • Melt the milk chocolate and pour over the top. Leave to set in the fridge and when the chocolate has hardened, slice into squares.



  • You can use any brand of Rice Bubbles, it doesn't matter if they are the supermarket own version.
  • Mars Bar Slices freeze really well.
  • Store in an air tight container for 5 days. 


Calories: 175kcal | Carbohydrates: 12g | Protein: 0g | Fat: 6g | Saturated Fat: 3g | Cholesterol: 5mg | Sodium: 41mg | Potassium: 41mg | Fiber: 0g | Sugar: 8g | Vitamin A: 340IU | Vitamin C: 2.6mg | Calcium: 4mg | Iron: 1.6mg