01 - Preheat oven to 425°F. Line 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 large bowl.
03 - Add chicken thighs to marinade, toss to coat. Let stand 5-10 minutes while preparing vegetables.
04 - Arrange potatoes, onion wedges, and bell pepper strips on baking sheet. Drizzle with 1 tbsp olive oil, season with pinch of salt and pepper, toss to coat, spread evenly.
05 - Nestle marinated chicken thighs skin-side up among vegetables. Spoon remaining marinade over chicken and potatoes.
06 - Roast 35-40 minutes until chicken is golden and reaches internal temperature 165°F and potatoes are crisp-tender.
07 - Broil 2-3 minutes for extra crispy skin if desired.
08 - Remove from oven, sprinkle with chopped parsley, serve with lemon wedges.