Place oil in a large saute pan. Place the pork chops in the pan and cook under low to medium heat until browned on both sides. Remove the pork chops from the pan to a plate.
Add onions to the pan, cook until softened. Stir in the beef broth and pepper, return the pork chops to the pan, adding any juices left on the plate. Spoon onions over pork chops, cover and simmer about 12 minutes or until no longer pink in the middle. Remove pork chops and onions from the saute pan to a plate.
In a medium bowl stir the sour cream and flour together. Add to the broth in the pan, whisk until well incorporate. Add the worcestershire sauce to the gravy, stirring to incorporate. If the gravy is too thick, thin it with milk to the consistency you prefer. Place the pork chops and onions back into the pan and cook until pork chops are heated back up. Serve immediately.