1/2 cup butter
1 cup sugar
2 eggs
1 cup buttermilk
2 cups flour
1 teaspoon baking soda
1 teaspoon baking powder
1/2 teaspoon salt

Cream butter and sugar. Beat in eggs. Combine flour, baking powder, soda and salt. Add buttermilk and flour mixture alternately to sugar mixture, beating well after each addition. Pour batter into greased 9-by-13 pan. Sprinkle top with 1/3 cup brown sugar, 1/4 cup white sugar and 1 teaspoon cinnamon. Bake at 350 degrees for 25-30 minutes.