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Tessa Dreyer

Mars Bar Brownies

Rich, fudgy Mars Bar Brownies made with gooey Mars Bar chunks. An easy homemade recipe that’s kid‑friendly, chocolate‑packed, and perfect for a quick dessert.
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Prep Time 20 minutes
Cook Time 35 minutes
Resting time 30 minutes
Total Time 55 minutes
Course: Dessert
Ingredients Equipment Method Notes

Ingredients
  

  • 200 g chocolate chips
  • 200 g unsalted butter
  • 3 large eggs or 4 medium
  • 275 g light brown sugar
  • 100 g plain flour
  • 25 g cocoa powder
  • 120 g Mars Bar chopped and frozen (about 2 bars)
  • 150 g milk chocolate chips optional

Equipment

  • 1 Stand Mixer or electric whisk
  • 1 9x9 baking dish

Method
 

Preheat & Prep
  1. Heat your oven to 180°C or 355℉. Line a 9×9" baking tin with parchment paper or aluminum foil.
Melt the Chocolate & Butter
  1. In the microwave or over a pan of simmering water, melt the 200g of chocolate chips and butter together until smooth. Set aside to cool slightly.
Combine the Mixtures
  1. Beat the eggs and brown sugar on high for about 5 minutes. Pour the cooled chocolate mixture into the whisked eggs and fold gently to keep the air in.
Add Dry Ingredients
  1. Sift in the flour and cocoa powder. Fold again until just combined.
Add the Mix‑Ins
  1. Fold in the frozen Mars Bar chunks and chocolate chips (if using). Freezing the Mars Bar helps keep the caramel from melting too quickly.
Bake
  1. Pour the batter into your prepared tin and bake for 25–30+ minutes, depending on how fudgy you like them. The centre should wobble slightly but not be liquid. I like 35 minutes and I cover it with aluminum foil for the last 10 minutes.
Cool & Enjoy
  1. Let the brownies cool completely to room temp before slicing. This helps them set into that perfect fudgy texture. Refrigerate once room temp.

Notes

These are best enjoyed about 30 minutes after baking them.
You can freeze these in an air tight container for up to 3 months. However, they will lose some of their "fudgey" texture in the process.