Stir butter to soften; add sugar and cream whip well until fluffy. Add egg and vanilla; beat well.
Sift together dry ingredients; add to creamed mixture alternately with milk, beating smooth after each addition. Pour into a greased 9-inch square baking pan
Sprinkle topping over all evenly.
Bake at 375^ for 30 minutes or until done. Cool 15 minutes; cut into squares and serve with Mock Holiday Champagne.
Combine ingredients and sprinkle evenly over above coffee cake. Bake as directed.