If you are not using sous vide to cook the chops, brine overnight in a salt/sugar/water solution. Heat your sous vide machine to 145 and seal the chops in vacuum bags with some salt, pepper and dried rosemary. Cook for 2.5-3 hours. If pan cooking the chops, dry them off from the brine.
Heat a few tbsp of oil in a heavy cast iron pan and get it smoking hot if you cooked sous vide. Place the chops in and allow to brown deeply for 1 minute. Flip and brown the other side as well. Since they are already cooked you don't need to worry about the temp.
If pan cooking, heat oil over high heat until smoking. Brown the chops as above and then transfer to a 375 degree oven to finish cooking until the center reaches 145-150.
In the pan you seared the chops in, add the garlic and onion over medium heat and cook, stirring occasionally for a few minutes. Add the spices, stock, cream, a little salt and pepper, mustard and stir well. Cook down until the sauce is reduced to a almost thickened sauce. Add the spinach and allow to wilt. Taste and adjust the seasoning, then add the chops to the pan to rewarm.
Serve with rice, potatoes, or a side salad. Spoon the sauce and spinach over the top of the chops.