This is from Dream Dinners cookbook.

Cinnamon Apple Cake

1 cup flour
1 cup dark brown sugar
1 cup granulated sugar
4 tsp. cinnamon
1/4 cup oil
1 tsp. salt
1/2 tsp. ginger
1 tsp. baking soda
1 tsp. baking powder
2 apples, peeled and sliced into bite-size pieces
1 cup buttermilk
1/4 cup nonfat egg substitute

Grease 9x13 pan. Combine flour, sugars, half of the cinnamon, the
oil, salt and ginger. Transfer 1 1/2 cups of this mixture to a small
bowl and add the rest of the cinnamon to it. Set aside for the
topping. Add the soda, baking powder, apples, buttermilk and egg to
the flour mixture. Do not over-stir. Pour into prepared pan and
sprinkle the reserved topping on. Cover with plastic wrap and foil
and freeze up to 3 months. To bake, thaw at room temperature before
baking. Preheat oven to 350. Bake for 1 1/2 hours or until the cake
is set and the top is golden brown. Serve warm or at room temp.