01 - Preheat the oven to 425°F. Line a large baking sheet with parchment paper or foil for easy cleanup.
02 - In a large bowl, whisk together olive oil, lemon juice, garlic, smoked paprika, oregano, thyme, red pepper flakes (if using), salt, and black pepper.
03 - Add chicken thighs to the bowl and toss to coat. Let marinate for 5–10 minutes while you prep the vegetables.
04 - Arrange halved potatoes, onion wedges, and bell pepper strips on the prepared baking sheet. Drizzle with 1 tablespoon olive oil and season with a pinch of salt and pepper. Toss to coat and spread into an even layer.
05 - Nestle the marinated chicken thighs, skin-side up, among the vegetables. Spoon any remaining marinade over the chicken and potatoes.
06 - Roast for 35–40 minutes, or until the chicken is golden and cooked through (internal temperature 165°F) and potatoes are crisp-tender.
07 - Broil for 2–3 minutes for extra crispy skin, if desired.
08 - Remove from oven, sprinkle with chopped parsley, and serve with lemon wedges.