Blueberry Sour Cream Cake

1/2 cup butter or margarine
1 cup sugar
3 eggs
1 cup sour cream
2 cups flour
1 tsp. baking soda
1/2 tsp. salt
1 tsp. vanilla
2 cups fresh blueberries, floured
1/2 cup packed brown sugar
1 /2 tsp. cinnamon

Cream butter and sugar; beat in eggs one at a time, beating until smooth after each addition. Stir in sour cream. Sift together flour, baking soda and salt; add to liquid mixture and beat until smooth. Add vanilla; fold in blueberries and spread mixture into 9x13x2-inch square pan or tube pan. Sprinkle batter with cinnamon and sugar mixture. Bake in 3500 F oven for 40 to 50 minutes.