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 prepared marinade in a separate small bowl. This will be used for basting during cooking and as an extra serving sauce.
03 - Rub the remaining marinade thoroughly over the chicken, coating all surfaces. Transfer to a large shallow dish or sealable plastic bag. Cover and refrigerate for a minimum of 2 hours, preferably overnight for maximum flavor penetration.
04 - Preheat 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 grates or in a roasting pan. Cook for 35 to 40 minutes, turning once midway through cooking. Baste generously with the reserved marinade during the final 10 minutes. Cook until internal temperature reaches 165°F and the skin is nicely charred and crispy.
06 - Remove chicken from heat and let rest for 5 minutes to allow juices to redistribute. Cut into serving pieces and arrange on a platter. Garnish with fresh parsley and serve with lemon wedges alongside.