Cut 1 garlic clove in half. Rub cut sides of garlic evenly over lamb chops. Combine 2 teaspoons oil, coriander seeds, and thyme in a small bowl. Rub spice mixture evenly over lamb chops. Let stand 8 minutes.
Mince remaining garlic clove. Sprinkle minced garlic with 1/8 teaspoon salt; mash with the side of a knife to form a paste. Combine garlic paste, remaining 2 teaspoons oil, juice, mint, honey, red pepper, and yogurt in a small bowl.
Heat a grill pan over medium-high heat. Remove lamb chops from marinade; discard marinade. Sprinkle lamb chops with remaining 3/8 teaspoon salt and black pepper. Coat pan with cooking spray. Add lamb chops to pan; grill 3 minutes on each side or until desired degree of doneness. Serve with yogurt mixture.