Streusel Coffee Cake

Cake Mixture:

2 cups flour
1 tsp. salt
1 cup sugar
1 cup milk
1/3 cup butter - softened
3 tsp. baking powder
1 egg

Streusel Mixture:

1/3 cup brown sugar
1/2 tsp. cinnamon
1/4 cup flour
3 Tablespoons firm margarine

Mix ingredients for cake mixture until smooth. In another bowl, mix streusel with fork or pastry blender. Set streusel mixture aside. Grease a 9 x 13 pan and pour half of the cake dough into pan. Sprinkle half of streusel on top of dough in pan. Pour remaining dough into pan. Sprinkle remaining streusel on top of cake. Bake at 350 for 25-30 minutes or until done.