1 1/2 c. flour
1/2 c. sugar
1 stick butter, room temperature
1 1/2 tsp. baking powder
1 egg
1 tsp. vanilla
1 qt. fresh or thawed frozen blueberries
2 c. sour cream
2 egg yolks
1/2 c. sugar
1 tsp. vanilla

Position rack in center of oven and preheat to 350 degrees. Butter 9- or 10- inch springform pan. Combine first 6 ingredients in large bowl and mix thoroughly. Turn into prepared pan. Sprinkle evenly with berries.

Combine sour cream, yolks, sugar and vanilla. Blend well. Pour over berries. Bake 1 hour or until edges of custard are lightly browned.