Instructions

1. 1. Preheat oven to 350º. Grease a 9×13 inch baking pan.
2. 2. In a large bowl, cream together 1 cup butter and sugar until light and fluffy. Beat in the eggs one at a time then stir in the sour cream and vanilla. Mix in flour, baking powder and salt. Spread ½ of batter in the prepared pan.
3. 3. Prepare the filling: In a medium bowl mix 1/3 cup flour, brown sugar, 2 tablespoons melted butter, and cinnamon. Sprinkle half the filling over the bottom layer of batter. Sprinkle blueberries on top of filling. Spread second half of batter over the filling, and top with remaining filling.
4. 4. Bake 35 to 40 minutes in the preheated oven, or until a toothpick inserted near the center comes out clean.