Cut peaches in slices. Toss with white sugar, 1 T. flour, and cinnamon. Spread mixture into a greased 9 x 13 pan (or casserole dish or whatever you have on hand).

In a separate bowl, combine brown sugar, flour, oats, and butter. Crumble over the top of the peaches.

Bake at 350 degrees for 45-50 minutes, or until hot and bubbly around the edges.

Serve with your favorite ice cream.