Start by bringing your boneless beef loin chops to room temperature. In a large shallow dish, mix together the plain flour, salt, garlic powder, and black pepper. Dredge each chop in the seasoned flour until both sides are evenly coated. Set them aside while you prepare your pan.
Heat the olive oil in a large pan over medium-high heat. Once the oil is shimmering hot, carefully place the beef chops in the pan. Sear them for about 3 minutes on each side until they are golden brown and just cooked through. Transfer the chops to a plate and lower the heat.
Leave about 1 tablespoon of fat in the pan. Add your finely diced rosemary and garlic to this fat. Sauté them gently until the garlic starts to turn golden but be careful not to let it burn.
Pour in the chicken stock and then whisk in the diced unsalted butter until it melts completely into a silky sauce. Keep stirring as it simmers for about 2-3 minutes.
Return the beef chops back into the pan with your sauce. Baste them for about one minute to soak up all that garlicky goodness. Serve immediately with a wedge of lemon on each plate.