In a medium bowl, mix together yogurt, garam masala, cumin, coriander, turmeric, paprika, garlic, ginger, lemon juice, olive oil, salt, and pepper.
Place the lamb chops in a shallow dish and coat them evenly with the marinade. Cover and refrigerate for at least 2 hours, or overnight for a deeper flavor.
Preheat the grill or oven to 400°F (200°C). Grill or roast the lamb chops for 4-6 minutes per side for medium-rare, or adjust the time based on your desired level of doneness.
Let the lamb chops rest for 5-10 minutes before serving. Garnish with fresh cilantro if desired, and serve with basmati rice, naan, or a side salad.