Sour Cream Blueberry Cake

1 1/2 c. Flour
1/2 c. Sugar
1 1/2 tsp. Baking Powder
1/2 c. Butter
1 Egg
1 tsp. Vanilla
4 c. Blueberries

2 c. Sour Cream
1/2 c. sugar
1 tsp. vanilla

Blend first four ingredients, then add egg and vanilla.  Pat in a 10″ springform pan.  Place blueberries on top of cake.  Mix remaining ingredients and pour over berries.  Bake at 375o  approximately 60 -70 minutes, or until edges are lightly brown.  Serve with whipped cream.