Wicked Blueberry Coffee Cake - cooking recipe

Ingredients

1/2 cup butter (or margarine)
1 cup white sugar
3 eggs, slightly beaten
1/2 teaspoon vanilla
1 teaspoon baking powder
1 teaspoon baking soda
1/4 teaspoon salt
2 cups flour
1 cup sour cream (or vanilla yogurt)
2 cups blueberries (fresh or frozen)
1 cup brown sugar
1/4 cup butter
1/4 cup flour

Preparation

Cream the 1/2 cup of butter and 1 cup of white sugar.
Add the eggs, vanilla, baking powder, baking soda, and salt.
Add the 2 cups of flour and sour cream alternately to egg mixture, mixing with a spoon.
Fold in the blueberries.
Pour mixture into a greased 9 x 13 baking pan.
In a seperate bowl, cream brown sugar and remaining 1/4 cup butter.
Add flour to get a semi-dry mixture.
Spread on top of batter.
Bake in 350 degree oven for 30 minutes.