Blueberry Spice Cake

Preheat oven to 375 °F (190 °C) . Grease and flour a 13 x 9 x 2-inch pan; set aside. Sprinkle blueberries with 1 tablespoon flour; set aside. Combine remaining 2 cups flour with baking powder, baking soda, salt and spices. Cream butter and sugar until light and fluffy. Add egg to butter mixture; beat well. Gradually beat in the molasses. Alternately add the creamed mixture with the milk to the dry ingredients, a little at a time, beating well after each addition. Gently fold in the blueberries. Pour into the prepared pan and bake for 30 to 35 minutes or until wooden pick inserted in center comes out clean. Dust with powdered sugar when completely cool.