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 halved potatoes, onion wedges, and bell pepper strips on the prepared baking sheet. Drizzle with 1 tablespoon olive oil and season with 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 until chicken is golden and cooked through to 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.