- Preheat oven to 380 degrees (less if using larger slices - see note) butter 9x7 baking dish.
- Slice peaches in half, remove pits and lay cut side down on board to slice to desired thickness. In mixing bowl add peaches, corn starch, sugar, water and nutmeg or cinnamon. (You can leave both these spices out if desired). Mix until coated and incorporated. Place mixture in bottom of baking dish and set aside.
- In mixing bowl add topping ingredients and mix by hand until crumbly and well incorporated together. Layer on top of peach mixture evenly.
- Place in preheated oven and bake about 45 minutes or until bubbly and browned on top. Take dish from oven and cool slightly on counter for about 1 hr before serving. Top with fresh whipped cream with just a hint of sugar in it or vanilla bean ice cream.