Ingredients
1/2 cup butter or margarine
1 cup 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
Directions
Cream 1/2 cup of butter and sugar. Add next five ingredients. Add 2 cups of flour and sour cream (or yogurt) alternately to egg mixture, mixing with a spoon. Fold in blueberries.
Pour mixture into greased 9”x13” baking pan. In a separate bowl, cream brown sugar and remaining butter. Add flour to get a semi-dry mixture. Spread on top of batter. Bake in 350° oven for 30 minutes.