Mix sifted flour, soda, baking powder with brown sugar. Cut in butter as for pie crust.
Mix in oatmeal and apples. Place in a low pan, approximately 9 x 13 inch.
Sprinkle with white sugar and cinnamon. Cover pan 15 minutes to allow the apples to steam.
Then bake, uncovered, at 350 degrees for 30-40 minutes, until apples are soft and crust is crisp. The variety of apples will determine the baking time needed.