Use a 9 x 9 inch pan (double for 9 x 13 inch).

4 tbsp. butter
1/2 c. packed brown sugar
6 apples, peeled and sliced
1 egg
2/3 c. sugar
1/4 c. boiling water
1 tsp. vanilla
1 c. flour
1/2 tsp. baking powder

Melt butter and brown sugar in pan. Mix in apples and put in baking dish. Beat egg, add sugar and boiling water in separate bowl. Add remaining ingredients and pour evenly over apples. Bake 45-50 minutes at 350 degrees until light brown and topping "pings". Serve while warm. Pour some milk over serving if desired.