Melt the butter and dark chocolate

• Melt the butter with the dark chocolate chips in a saucepan over low heat until smooth.
• Remove from the heat and let cool slightly.

Whisk the sugars and eggs

• Whisk the brown sugar and sugar into the chocolate mixture.
• Add the eggs and vanilla extract and whisk until glossy and slightly thickened.

Add the dry ingredients

• Sift in the flour, cocoa powder and salt.
• Fold gently until just combined, without overmixing.

Fold in the chocolate chunks

• Fold the white chocolate chunks and chopped Kinder chocolate into the batter, keeping a little for the top.
• Scatter the reserved chocolate over the surface.

Bake the brownies

• Pour the batter into a lined baking dish and spread evenly.
• Bake at 180 °C until the edges are set and the centre is still slightly soft.

Cool and cut

• Let the brownies cool completely in the dish.
• Cut into squares and serve.