Preheat oven to 350. Arrange apple slices in bottom of a lightly greased 9x13 baking dish. Mix lemon juice and water and pour over apples. Sprinkle cinnamon on top. Mix remaining ingredients until crumbly. Spread evenly over the apples. Bake for about 40 minutes, or until golden brown.
We like a scoop of vanilla ice cream or Cool Whip. You can also mix 2 T. of caramel sauce with a T. of peanut butter for a decadent sauce.