Season pork chops all over with 1 tsp seasoned salt and 1 tsp black pepper.
In a shallow dish, mix together flour with remaining 1 tsp seasoned salt and 1/2 tsp black pepper, granulated garlic, onion powder and cayenne. Set aside 2 Tbsp flour of the flour to make the gravy. Coat the pork chops on all sides with the remaining flour mixture, shaking off any excess flour.
In a large, heavy skillet over medium heat, heat 2 Tbsp oil. To the pan add the pork chops cooking on each side until golden, 4-5 minutes per side. Using tongs, lift each pork chop from skillet, and sear around the sides of chops until golden brown, about 1 minute per chop. Transfer to plate. (If cooking in batches, add the reserved 2 Tbsp oil to the pan for the second batch.)
To the pan add onions, adding more oil, if needed. (about 1-2 tablespoons) Cook over medium heat, scrape any browned bits from the bottom of the pan. Season with more seasoned salt and black pepper to taste. Cook until very soft and slightly caramelized, 8-10 minutes then add the garlic. Cook for 1-2 minutes longer.
Add butter to the skillet and let melt, then sprinkle in reserved 2 Tbsp seasoned flour. Cook while stirring, until the flour is no longer raw, about a 30-60 seconds. Stir in chicken broth, heavy cream, Worcestershire sauce and mustard and bring to a gentle simmer. Cook just until the sauce begins to thicken, about 5 minutes.
Mix in 1 1/2 Tbsp fresh thyme, then return pork chops to skillet. Cook uncovered over medium-low heat until the pork is cooked through, about 10 minutes more.
Garnish with fresh thyme serve immediately drizzled with sauce.