Preheat the oven to 425 degrees. Combine the olive oil, salt, mustard, thyme, and pepper. Spread all over pork. Optional for extra flavor: Brown the pork in a hot skillet with a touch of oil to sear the outside. Cook 1-2 minutes on each side until browned.
Optional: Add the apple, onion, and chicken broth mixture to a pan. Bring to a simmer and cook for 4-5 minutes until it reduces and thickens. Add a touch of butter. This creates a thicker sauce for the pork. Then slice and serve the pork with apples, onions, and sauce.