1/2 c. soft butter
1 c. sugar
3 eggs
2 c. sifted all-purpose flour
1 tsp. baking powder
1 tsp. baking soda
1/2 tsp. salt
1 c. sour cream
1 tsp. vanilla
1 tsp. ground cardamom
2 c. blueberries
1/2 c. brown sugar

Cream butter and sugar. Add eggs one at a time, beating well. Sift dry ingredients. Add gradually to egg mix alternating with sour cream and ending with flour. Stir in vanilla and cardamom. Fold in blueberries. Sprinkle on top with brown sugar. Spread in a 9x13 inch pan greased and floured. Bake at 325 degrees for 45 to 50 minutes.