Mix together flour, sugar, Xanthan Gum and melted margarine until crumbly. Take out 1 cup of the crumb mixture, add the cinnamon and set aside.
To the remaining crumb mixture add the rest of the ingredients. Mix well and pour batter into a greased 9 X 13" pan. Sprinkle remaining crumb mixture over the top of the dough.
Bake at 350°F oven for 40-45 minutes until a stick will come out clean. Cool and enjoy! Makes 18 slices.