01 - Preheat oven to 425°F. Line a large baking sheet with parchment paper or foil.
02 - Whisk together olive oil, lemon juice, garlic, smoked paprika, oregano, thyme, red pepper flakes, salt, and black pepper in a large bowl.
03 - Add chicken thighs to the bowl and toss to coat. Let marinate for 5–10 minutes while preparing vegetables.
04 - Arrange potatoes, onion wedges, and bell pepper strips on the prepared baking sheet. Drizzle with 1 tbsp olive oil, season with salt and pepper, toss to coat, and spread evenly.
05 - Nestle marinated chicken thighs, skin-side up, among the vegetables. Spoon remaining marinade over chicken and potatoes.
06 - Roast for 35–40 minutes until chicken is golden and reaches internal temperature of 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.