In a large bowl, combine the olive oil, garlic powder, onion powder, oregano, smoked paprika, salt, and pepper. Add the chicken thighs and coat them well in the marinade. Let it marinate for at least 30 minutes (or up to overnight in the fridge for more flavor).
Preheat a grill or skillet over medium-high heat. Cook the marinated chicken thighs for about 6-7 minutes on each side, or until fully cooked and golden brown. Once cooked, remove from heat and let them rest for 5 minutes before slicing.
While the chicken is resting, prepare the vegetables. In a bowl, mix the cherry tomatoes, cucumber, bell pepper, red onion, olives, and parsley. In a small bowl, whisk together the lemon juice, salt, and pepper. Pour the dressing over the veggies and toss to combine.
In meal prep containers, start with a base of cooked brown rice or quinoa. Top each portion with sliced chicken, the mixed veggie salad, and crumbled feta cheese.
Seal the meal prep containers and refrigerate for up to 4 days. When ready to eat, simply reheat the chicken and rice or enjoy cold.
Notes
Can be stored in the refrigerator for up to 4 days.