Boston Cream Pie

Heat the oven to No 4/350°F/175°C. Butter and flour the cake pans/tins. Cream the butter, gradually beat in the sugar, and continue beating until the mixture is blended thoroughly. Gradually beat in the eggs, a little at a time, and beat until the mixture is smooth and light. Sift the flour with the baking powder. Stir the flour into the egg mixture in three batches, alt