Preheat the oven to 425 degrees Fahrenheit (220 degrees Celsius).
Pat the chicken thighs thoroughly dry with paper towels to ensure skin crispiness.
In a large mixing bowl, whisk together the olive oil, minced garlic, oregano, thyme, paprika, salt, and pepper.
Add the chicken thighs, red onion wedges, and olives to the bowl, tossing until all components are evenly coated in the herb oil.
Place the chicken skin-side up in a single layer in a heavy-bottomed roasting pan or cast-iron skillet.
Nestle the lemon slices between and under the chicken pieces.
Roast for 30 to 35 minutes, or until the internal temperature reaches 165 degrees Fahrenheit (74 degrees Celsius) and the skin is golden brown.
Rest the chicken for 5 minutes before garnishing with fresh parsley and serving.