Melt the chocolate and butter

• Place the milk chocolate and butter in a microwave-safe bowl.
• Microwave in short bursts, stirring in between, until fully melted.

Whisk the eggs and sugars

• Crack the eggs into a large bowl.
• Add the brown sugar, white sugar and vanilla sugar.
• Whisk until the mixture is pale and golden.

Combine the melted chocolate

• Pour the melted chocolate and butter into the egg mixture.
• Mix everything together until smooth.

Add the dry ingredients

• Add the flour and cocoa powder.
• Fold gently until just combined and no dry streaks remain.

Add the caramel bar and bake

• Pour the batter into a lined baking dish.
• Push the pieces of chocolate caramel bar into the brownie dough.
• Bake at 180 °C for 30 minutes.

Cool and slice

• Let the brownies cool completely in the dish before cutting into squares.