Preheat oven to 325 degrees and spray a 9x13-inch baking dish with cooking spray.
Heat oil in a large nonstick skillet over medium-high heat. When hot add the thawed diced potatoes. Cook for 4 to 5 minutes to get just a little color on them and then transfer them to a large bowl.Season them with about 1/2 teaspoon of salt and 1/2 teaspoon of pepper.
Pat the pork chops dry with paper towels and season with the seasoned salt and about 1/4 teaspoon of pepper.Add a little more oil to the skillet if needed and place back over medium-high heat.Add pork chops and cook for about 2 minutes per side.
Mix the condensed soup, sour cream and milk in with the potatoes until combined.Mix in half the fried onions and about 3/4 of the cheddar cheese.
Spread potato mixture evenly in the prepared baking dish. Place pork chops on top.
Cover baking dish and bake for 40 minutes.
Uncover and sprinkle remaining fried onions and cheddar cheese on top.Return to oven uncovered for 5 minutes.