01 - Combine chili peppers, garlic, red bell pepper, smoked paprika, oregano, cumin, salt, black pepper, olive oil, red wine vinegar, lemon juice, and zest in a blender. Process until completely smooth to create a uniform peri peri sauce.
02 - Set aside 3 tablespoons of the prepared marinade in a small container. This will be used later for basting during cooking and as an extra serving sauce.
03 - Rub the remaining marinade thoroughly over the chicken, ensuring complete coverage on all surfaces. Place in a large dish or sealable bag and refrigerate for a minimum of 2 hours, preferably overnight for optimal flavor penetration.
04 - Heat grill or oven to 400°F. If using a grill, lightly oil the grates to prevent sticking.
05 - Arrange chicken skin-side up on the grill or in a roasting pan. Cook for 35-40 minutes, turning once halfway through and brushing with the reserved marinade. Continue until the internal temperature reaches 165°F and the skin is nicely charred and crispy.
06 - Let the chicken rest for 5 minutes to allow juices to redistribute. Cut into serving pieces and present with lemon wedges and a sprinkle of fresh parsley.