Grease and flour a 9 x 13-inch pan and smaller 8 x 8-inch pan or similar. Cream 1/4 lb. butter and sugar. Add eggs and beat well. Add vanilla. Sift 3 cups flour and baking powder and add to butter mixture alternately with the evaporated milk. (Begin and end with milk.) Pour batter into pans.

Topping: Combine the last three ingredients. Sprinkle topping over batter; swirl through batter with knife.

Bake 30 to 35 minutes in preheated oven at 350°.