Ingredients

• 110 grams dark chocolate
• 110 grams butter
• 220 grams caster sugar
• 2 eggs
• 80 grams plain flour
• 30 grams cocoa powder
• 1/2 teaspoon salt
• 1/2 teaspoon baking powder
• 100 grams plain flour (for cookie dough)
• 95 grams caster sugar
• 45 grams demerara sugar
• 120 grams butter
• 1/2 teaspoon salt
• 1/2 teaspoon vanilla extract
• 2 tablespoons buttermilk
• 50 grams dark chocolate chips
• 100 grams double cream
• 100 grams dark chocolate