Banana Cake (Sallysbaking)

1 1/2 cups mashed bananas (4 medium or 3 large) 3 cups flour 3 t bp 1 t bs 1 t cinnamon 3/4 cup softened butter (unsalted) 1 cup sugar 1/2 c brown sugar 3 eggs (large) 2 t vanilla 1 1/2 cups buttermilk Cream butter and sugar. Add eggs and vanilla and bananas. Mix dry ingredients and then add alternately with the buttermilk. Pour into greased/floured baking pans and bake at 350 till they are done! Cream cheese frosting is good.