Mark's Gimme S'more Brownies recipe - The Great British Bake Off

Ingredients

• 140g unsalted butter
• 115g 70% dark chocolate chips
• 1 tsp espresso powder
• 150g light brown soft sugar
• 100g caster sugar
• ½ tsp vanilla extract paste
• 3 eggs
• ½ tsp salt
• 40g cocoa powder
• 60g plain flour
• 50g white chocolate chunks
• 50g milk chocolate chunks
• 90g unsalted butter, at room temperature
• 30g light brown soft sugar
• 60g golden caster sugar
• 1 egg yolk
• 1 tsp vanilla paste
• 115g plain flour
• ¼ tsp bicarbonate of soda
• ¼ tsp baking powder
• 90g milk chocolate chunks
• 115g caster sugar
• 2 egg whites
• 60g dried cranberries