Mix condensed cream of mushroom soup, milk, sour cream, salt, and pepper in a bowl. Fold hash brown potatoes, ¾ cup Cheddar cheese, and about ¾ of the French-fried onions into the soup mixture.
Pour into a 9x13-inch baking dish that has been sprayed with non-stick spray or buttered.
Arrange pork chops atop the mixture. Cover the dish with aluminum foil.
Bake for 40 minutes.
After the casserole has baked for 40 minutes, carefully remove foil and cover the pork chops with remaining ¼ cup Cheddar cheese and remaining French-fried onions.
Place casserole back into the oven until the cheese melts, or about 5 minutes. An instant-read thermometer inserted into the center of the pork chops should read 145°F.
Serve immediately.