Whoopie pies

Method

• 1
  Preheat the oven to 180°C. Line 2-3 baking trays with baking paper.
• 2
  Sift the flour, cocoa, baking powder and bicarbonate of soda into a bowl.
• 3
  Beat the butter and sugar in an electric mixer on high speed until light and fluffy. Beat in the egg, followed by the vanilla and buttermilk. Reduce speed to low, add dry ingredients and beat until combined. Place 32 tablespoonfuls of mixture 4cm apart on the prepared trays. Bake for 7-8 minutes until doubled in size and firm on top when gently pressed. Cool on trays.
• 4
  Place marshmallows and 1 teaspoon warm water in a microwave-safe dish and microwave on high for 20 seconds, then stir until smooth. Spread the melted marshmallows over 16 of the rounds, then sandwich them together with the remaining rounds.