Pat chicken thighs dry. Add chicken in a large bowl and top with olive oil, lemon juice, garlic, shawarma spice, salt and pepper. Toss and combine ingredients, and marinate in an airtight container or resealable freezer ziplock for 3-4 hours, or at least 30 minutes.
Set grill or grill pan to medium heat and cook for about 7 minutes on each side. Make sure you use tongs and flip over until fully cooked and juices run dry.
Sprinkle with fresh parsley, and add lemon wedges for garnish. Add a dash of aleppo pepper for a kick! Serve with a simple and refreshing salad like tomato and mint!