Preheat your grill or grill pan over medium-high heat. In a small bowl, mix together olive oil, honey, harissa paste, garlic powder, smoked paprika, salt, and pepper.
Coat the chicken thighs with the harissa mixture, ensuring they are well covered. Let them marinate for at least 15 minutes for better flavor.
Grill the chicken for about 6-7 minutes on each side, or until the internal temperature reaches 165°F. Remove from the grill and let rest for 5 minutes before slicing.
While the chicken is resting, prepare the bowls. In each bowl, layer 1/2 cup of cooked quinoa, followed by a handful of baby spinach, diced cucumber, and halved cherry tomatoes.
Slice the grilled chicken and place it on top of the vegetables in each bowl.
Sprinkle crumbled feta cheese and chopped parsley over the chicken. Serve with lemon wedges on the side for drizzling.