Preheat oven to 425°F. Season pork chops lightly with salt and pepper.
In a small bowl, combine mustard, mustard powder, thyme, and garlic; mix well and spread evenly over both sides of the chops. Heat the oil in a large skillet over medium-high.
Add the chops and brown for 2 minutes per side.
Transfer your skillet to the oven and cook for an additional 5-8 minutes, until no longer pink and cooked through. Serve over sauted baby spinach.