This recipe is from Stella Dinse from Boston, New York

Bottom Layer: (Cream following ingredients together and spread in 9 x 13-inch baking pan)

2 cups white flour, sifted
1 cup white sugar
6 tablespoons butter, softened
2 teaspoons baking powder
1/4 teaspoon salt
1 egg plus milk to measure 3/4 cup

Middle Layer: (Mix following ingredients together and spread on top of bottom layer)

8-oz. original brand cream cheese, softened
4-oz. sour cream
2/3 cup white sugar
1 teaspoon vanilla
2 large eggs

Top Layer: Crumb Topping (Use a fork to mix following ingredients together and sprinkle on filling):

1 cup white flour
1/2 cup butter
1 teaspoon vanilla
1/2 cup white sugar

Bake coffeecake in 350 degree oven for 40 to 50 minutes, or until toothpick inserted comes out clean.