Arrange pork chops in a 9x13 inch baking dish. Layer potatoes, beans and onion on top of chops. Season with salt and pepper to taste. In a medium bowl combine soup and milk and mix together; pour mixture over chops and veggies. Cover dish with aluminum foil and bake in the preheated oven for 1 hour or until internal temperature of pork has reached 145 degrees F (63 degrees C).