Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking dish.

Place sliced potatoes and sliced onions in the prepared dish; mix gently. Cover potatoes and onions with cheese. Fill the dish with milk halfway. Place butter in several places over cheese. Place pork chops on top. Season with salt and pepper.

Bake in the preheated oven until potatoes are tender, about 60 minutes, turning pork chops over halfway through cooking. An instant-read thermometer inserted into the center of meat should read at least 145 degrees F (63 degrees C).