Chocolate Cake with Coffee Buttercream

Ingredients

• 240ml of brewed coffee (cooled to room temperature)
• 240g plain flour
• 1 tbsp cornflour
• 200g granulated sugar
• 100g dark brown soft sugar
• 50g cocoa
• 1 tsp baking powder
• 1 tsp bicarbonate of soda
• ½ salt
• 110ml vegetable oil
• 180g sour cream
• 2 eggs
• 2 tsp vanilla extract
• 265g unsalted butter
• 435g icing sugar
• 2-4 tbsp espresso
• 1 tsp vanilla extract (optional)
• Coffee Beans (optional for decoration)