Preheat over to 325°. Spray 3-quart casserole dish with nonstick cooking spray.
In large skillet with 2-inch sides, cook bacon over medium heat 10 minutes, stirring occasionally. Add onion and cook 5 to 7 minutes or until bacon is lightly browned. Remove from heat and stir in remaining ingredients.
Transfer mixture to prepared casserole dish and bake 1 hour.