Spray an 8x8 baking dish with cooking spray. Peel and dice pears and place in dish. Place white sugar, flour, and 1/2 teaspoon cinnamon on top of pears and stir until well coated.
In medium bowl place oats, brown sugar, cinnamon, and butter. Cut together with a long tined fork until well blended and crumbly. Sprinkle over top of pears.
Bake at 375 for 40-45 minutes. Serve hot on it's own, drizzled with caramel, or topped with vanilla ice cream.