Season the Pork Chops: Pat the pork chops dry with paper towels. Combine the salt, black pepper, paprika, and garlic powder, then season the chops evenly on both sides.
Coat with Flour: Lightly dredge each pork chop in the flour, coating both sides. Shake off any excess flour.
Sear the Pork Chops: Heat the vegetable oil in a large cast-iron skillet over medium heat. Add the pork chops and cook for 6 to 8 minutes on the first side, without moving them, until deeply golden. Flip and continue cooking until the second side is well browned. Work in batches if needed, then transfer the pork chops to a plate.
Cook the Onion: Add the butter and chopped onion to the same skillet. Cook over medium heat for about 5 minutes, until softened and lightly golden.
Add the Garlic and Thyme: Stir in the minced garlic and thyme. Cook for about 30 seconds, just until fragrant.
Make the Dijon Cream Sauce: Pour in the chicken broth and scrape up the browned bits from the bottom of the skillet. Stir in the heavy cream and Dijon mustard, then bring the sauce to a gentle simmer.
Finish the Pork Chops: Return the pork chops and any juices from the plate to the skillet. Reduce the heat to low and cook gently in the sauce for about 10 minutes, spooning the sauce over the chops as they finish cooking. The pork is ready when the thickest part reaches 145°F (63°C), without touching the bone.
Serve: Remove the skillet from the heat and let the pork chops rest in the sauce for at least 3 minutes. Spoon the creamy Dijon sauce over each chop, garnish with chopped parsley, and serve warm.