Cinnamon crumb cake

Ingredients
2 1/2 cups all-purpose flour
1 1/3 cups packed brown sugar
1 1/2 teaspoons ground cinnamon
1/4 teaspoon salt
1/2 cup chilled stick margarine or butter, cut into small pieces
1 teaspoon baking powder
1 teaspoon baking soda
1 cup low-fat buttermilk
2 teaspoons vanilla extract
2 large eggs
Cooking spray


Preparation
Preheat oven to 350°.
Lightly spoon the flour into dry measuring cups, and level with a knife. Combine the flour, brown sugar, cinnamon, and salt in a bowl, and cut in margarine with a pastry blender or 2 knives until the mixture resembles coarse meal. Reserve 1/2 cup flour mixture for topping, and set aside.

Combine remaining flour mixture, baking powder, and baking soda, and add the buttermilk, vanilla, and egg. Beat at medium speed of a mixer until blended. Spoon batter into an 9x13 in. pan coated with cooking spray. Sprinkle reserved 1/2 cup flour mixture over batter. Bake at 350° for 30 minutes or until cake springs back when touched lightly in center. Cool on a wire rack.