Preheat oven to 350 degrees.
Toss sliced apples with the other base ingredients.
Pour cereal and 1/2 t cinnamon into a resealable plastic bag, crush coarsely.
Spray 8 in casserole dish with nonstick spray.
Layer half of the apples in the dish, top with half the cereal mixture.
Repeat with rest of apples and rest of cereal.
Drizzle water over the top.
Bake for 45 minutes, or until apples are soft and topping is lightly browned.
Cool completely before serving.