1 1/2 c. flour
2/3 c. sugar
1 1/2 tsp. baking powder
1/2 c. butter, softened
1 egg, lightly beaten
2 1/2 tsp. vanilla
4 c. fresh blueberries
2 c. sour cream
2 egg yolks
1/4 tsp. cardamom
1/4 tsp. grated lemon peel

Butter a 9 inch springform pan. In a large bowl stir together flour, 1/3 cup sugar and baking powder. Stir in 1/2 cup butter, egg and 1 1/2 teaspoons vanilla until combined. Sprinkle evenly in prepared pan; cover with blueberries.

In medium bowl, stir together 2 cups sour cream, remaining 1/3 cup sugar, 2 egg yolks, 1 teaspoon vanilla, cardamom, lemon peel; pour evenly over blueberries. Bake in a 350 degree oven for 50 to 55 minutes or until lightly browned around the edge. Cool completely. Makes 8 to 10 servings.