Prepare the potatoes: Peel and chop the potatoes into even pieces. Boil in salted water for 15-20 minutes until tender. Drain and return to low heat.

Make the mashed potatoes: Add butter, milk, and salt to the drained potatoes. Mash or whisk until smooth and creamy. Keep warm.

Cook the lamb chops: Heat olive oil in a skillet over medium-high heat. Season lamb chops with salt and pepper. Sear for 3-4 minutes per side for medium doneness.

Add garlic and herbs: In the last minute of cooking, add butter, garlic, thyme, and rosemary. Spoon the garlic butter sauce over the chops.

Finish and serve: Let the lamb rest for a few minutes. Plate the lamb chops with mashed potatoes and drizzle with the remaining garlic butter sauce. Squeeze lemon juice over the chops before serving.