01 - Combine chili peppers, garlic, red bell pepper, smoked paprika, oregano, cumin, salt, black pepper, olive oil, red wine vinegar, lemon juice, and lemon zest in a blender. Process until completely smooth to create the peri peri sauce.
02 - Set aside 3 tablespoons of the blended marinade separately for basting during cooking and serving at the table.
03 - Coat the chicken thoroughly with the remaining marinade, working the mixture under the skin and into all crevices. Place in a non-reactive dish or sealable bag, refrigerate for a minimum of 2 hours, preferably overnight for optimal flavor penetration.
04 - Prepare grill or oven to 400°F. If using a grill, brush grates with oil to prevent sticking.
05 - Arrange chicken skin-side up on grill grates or in a roasting pan. Cook for 35 to 40 minutes, flipping once midway and applying reserved marinade with a brush. Continue until internal temperature reaches 165°F and skin is crisped with charred spots.
06 - Let chicken rest for 5 minutes to allow juices to redistribute. Cut into serving portions and accompany with lemon wedges and fresh parsley garnish.