In a bowl, whisk together yogurt, 1 minced garlic clove, 1 tablespoon lemon juice, salt, and pepper. Chill for 10 minutes to allow flavors to develop.
In a separate bowl, combine ground chicken, chopped onion (with moisture squeezed out), remaining 2 minced garlic cloves, parsley, cumin, coriander, salt, and pepper. Mix until slightly sticky but do not overwork.
Shape mixture into 10–12 kofta logs or oval patties. Chill for 10 minutes to help them firm up.
Preheat grill or grill pan to medium-high heat and lightly oil grates with olive oil.
Grill kofta for 4–5 minutes per side, until browned and internal temperature reaches 165°F.
Pan option: Sear in a lightly oiled skillet for 4–5 minutes per side until fully cooked.
Stir remaining 1 tablespoon lemon juice into the yogurt sauce if desired for extra brightness.
Serve the Chicken Kofta with Creamy Garlic Yogurt Sauce spooned underneath or on the side. Garnish with extra parsley and lemon wedges.