1. COMBINE the butter, chocolate and brown sugar in a saucepan and stir over a medium heat until melted and smooth. Remove from heat and whisk in the eggs. Add the sifted flour, cocoa and baking powder and stir until well combined. Pour into a greased and base lined 28cm x 18cm slice pan.
2. BAKE in a moderate oven 180C for 30 minutes. Top evenly with CADBURY Creme Eggs and press in a little. Bake a further for 5-7 minutes until the eggs are just melted. Cool on a wire rack before cutting into 12 pieces. Store in an airtight container until required.