In a large skillet over medium heat, brown pork chops on both sides in oil. Set aside.
Combine sour cream, soup and milk in a large bowl; stir in hashbrowns and onion. Spread sour cream mixture in an ungreased 13"x9" baking pan and sprinkle with cheese. Top with pork chops.
Bake, uncovered, at 375° for 45 to 50 minutes or until heated through and pork chops are fully cooked.