- Preheat oven to 180 degrees Mix in your caster sugar and butter well. When incorporated well, add the warm milk. Then, add your flour, cocoa powder, and baking powder. Mix well. Into a prepared glass bowl, pour in the batter. In the middle, add 2-3 cubes of chocolate and using a spoon, cover the chocolate. Bake only for 10-12 minutes until you see the edges and tops are crisp. Serve with berries and icecream.