Preheat the oven to 375 degrees and set aside an 8 x 8 Pyrex dish, baking pan, or casserole dish.
Peel and slice the apples into thin slices. In a large mixing bowl, add the peeled apples and filling ingredients. Then, using a spatula, toss the ingredients together until the apples are evenly coated. Pour the apple filling into an 8x8 pan and set aside.
In a large mixing bowl, add the dry ingredients. Then cut the butter into small cubes. Mix using a fork or your fingers until the topping is crumbly.
Sprinkle the crumb topping evenly over the apples.
Bake for 30 -35 minutes or until the sides are bubbly and the crust has a light brown crisp.
Remove from the oven and let cool for 5-10 minutes before serving. Add a scoop of vanilla ice cream if you desire.
Store in an airtight container or cover the pan with aluminum foil.