1Mix together flour, sugar, salt and butter til crumbly. Measure and set aside 3/4 cup of this mixture.
2To the remaining mixture, add the baking powder, soda, cinnamon, egg and buttermilk. Beat til batter is smooth.
3Spread batter in greased 8 inch square pan. Sprinkle 3/4 cup reserved mixture on top. Bake at 350 for 50 to 60 minutes or til wooden pick inserted in center comes out clean. Cool ten minutes. Cut and serve warm