Combine sugar, 2 c. biscuit mix, egg, milk and apples; beat vigorously for 30 seconds.
Spread batter in greased 9" round baking pan.
Combine brown sugar, cinnamon and 1/3 c.biscuit mix.
Cut in butter until crumbly.
Sprinkle over batter.
Bake in 400° oven 25 minutes or until golden brown