Mix baking mix, sugar, milk and egg, beat for 30 seconds. Spread batter in pan.
Bake for 20 minutes or until goldne brown.
Heat butter in skiller until melted, add apple pieces. Mix sugar baking mix and cinnamon, stir into apples. Cook over low heat 15 minutes, stirring occasionally, stir in water. Cook over low heat, stirring frequently until apples are crisp tender and sauce is desired consistency. Spoon Apple Topping mixture over warm coffee cake.