Filling
5 medium apples (Such as Honeycrisp, Gala, or Granny Smith) peeled and thinly sliced
1/2 cup water
1 tsp cinnamon (The recipe calls for just 1/2 tsp, but with that many apples, it probably needs more)
Topping
1/2 cup butter, softened to room temperature
1 cup brown sugar
1/2 cup flour
1/4 tsp salt
1 cup Grape Nuts cereal
Optional
Heavy whipping cream
Directions
Place thinly sliced apples in a well-greased 1-quart glass casserole dish (This is about the equivalent of a smaller sized loaf pan. See here for a comparison chart on casserole dishes and baking pans.) Sprinkle cinnamon over the apples, and then pour the water on top.
In another bowl, combine the butter, brown sugar, flour, salt, and Grape Nuts cereal. Mix together well until resembles coarse crumbs. Sprinkle over the apples.
Bake at 350 degrees for about 30 minutes, or until apples are tender and topping is a golden brown.
Best served warm, drizzled with heavy cream (You could whip up the cream, if desired, or serve with ice cream.)