1Heat oven to 350°. Spray square baking dish, 8x8x2 inches, with cooking spray. Trim fat from pork if necessary. Sprinkle both sides of pork with salt and pepper.
2Spray 10-inch nonstick skillet with cooking spray; heat over medium-high heat. Cook pork in skillet about 10 minutes, turning once, until brown. Place in baking dish.
3Mix remaining ingredients except onions in medium bowl. Spread over pork chops.
4Bake uncovered about 50 minutes or until mixture is bubbly. Sprinkle onions over casserole. Bake uncovered 5 minutes.