Directions

1. In a large, flat-bottomed container, stir together yogurt or yogurt whey, garlic, mustard powder, and celery seeds. Add pork chops, turning to coat; add more yogurt if needed to fully coat pork chops. Cover and refrigerate at least 6 hours or up to 12 hours.
2. About 30 minutes before cooking, remove pork chops from marinade, and place on a rimmed baking sheet in a single layer. Discard marinade. Pat pork chops dry using paper towels. Season with salt and pepper, rubbing liberally on both sides of pork chops.
3. Heat a 12-inch cast-iron skillet over medium-high until very hot, about 5 minutes. Add 1 tablespoon olive oil, swirling to coat skillet; add 3 pork chops. Sear until golden brown on one side, about 4 minutes. Flip pork chops, and cook until seared on other side, meat is just slightly pink in center, and a meat thermometer inserted in thickest portion of pork chops registers 145°F, 3 to 4 minutes, reducing heat if exterior gets too brown before pork chops are cooked through. Transfer pork chops to a clean plate; tent loosely with aluminum foil to keep warm. Wipe skillet clean, and repeat cooking process with remaining 1 tablespoon oil and remaining 3 pork chops.
4. Reduce heat to medium-low. Add shallots to skillet, and cook, stirring often, until soft and caramelized, about 3 minutes. Pour wine into skillet; using a spatula, scrape up browned bits from bottom of skillet. Cook until wine is reduced by half, 2 to 3 minutes; turn off heat, and stir in butter and Dijon mustard. Pour sauce over pork chops.