Place the apple slices in an 8 inch cake pan and toss with lemon juice. Press down to even out the apples.

Prepare the topping by combining all the dry ingredients first. Then cut in the butter until the mixture resembles a coarse meal. (This works really well in a food processor.) Spread the topping evenly over the apples and press down. Bake about 1 hour in a 350 degree oven.