Preheat your oven to 350°F. In a 9×13-inch baking dish, toss the chopped onion and minced garlic with olive oil. Place the dish in the oven for 10-15 minutes to warm and soften the aromatics.
As the onions and garlic become tender, coat the chicken thighs with paprika, dried thyme, rosemary, garlic powder, onion powder, salt, and pepper.
Remove the dish from the oven and let it rest for 5 minutes. Garnish with fresh parsley, if you like, before serving.