Season the Chops : Pat the beef chops dry with a paper towel. Season both sides generously with salt, pepper, garlic powder, and paprika.
Cook the Chops : Heat olive oil or butter in a large skillet over medium-high heat. Add the beef chops and cook for 4–5 minutes per side (for medium-rare), or until they reach your desired level of doneness. Add rosemary or thyme to the skillet in the final minute for additional flavor. Remove from the skillet and let rest for 5 minutes.
Prepare the Sauce : In a medium saucepan, melt the butter over medium heat. Stir in the flour and cook for 1–2 minutes, whisking continuously, until golden and bubbly. Gradually add the milk, whisking to create a smooth sauce. Stir in salt, black pepper, smoked paprika, and thyme (if using). Cook for 2–3 minutes until the sauce thickens. If using, stir in the shredded cheddar cheese until melted and smooth.
Layer the Potatoes : Preheat your oven to 375°F (190°C). Grease a baking dish (9x13-inch recommended) with butter or cooking spray. Layer half of the potato slices in the dish, followed by half of the sliced onions. Pour half of the sauce evenly over the potatoes. Repeat with the remaining potatoes, onions, and sauce.
Bake the Potatoes : Cover the dish with foil and bake for 40 minutes. Remove the foil and bake for an additional 15–20 minutes, or until the potatoes are tender and the top is golden brown.
Serve : Plate the beef chops alongside the scalloped potatoes. Garnish with fresh thyme or parsley for a polished finish.