Combine the olive oil, lemon juice, garlic, cumin, coriander, smoked paprika, turmeric, cinnamon, salt and pepper in a bowl. Add the chicken, turn to coat, and leave at least 20 minutes at room temperature, or up to overnight in the fridge.
if you marinate overnight, pull the chicken out 20 minutes before cooking so it isn't fridge-cold on the pan.
20 minutes was perfect, no more time needed. It was the best tasting chicken I've had in a while.