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 vibrant red peri peri sauce.
02 - Measure out 3 tablespoons of the blended marinade and set aside in a small bowl. This reserved portion will be used for basting during cooking and as an extra serving sauce.
03 - Coat the chicken thoroughly with the remaining marinade, massaging it into the meat and under the skin if possible. Transfer to a large shallow dish or sealable bag, ensuring chicken is fully covered. Refrigerate for a minimum of 2 hours, preferably overnight for maximum flavor penetration.
04 - Prepare your grill or oven by heating to 400°F. If using a grill, clean the grates and lightly oil them to prevent sticking. For oven cooking, position a rack in the center position.
05 - Arrange chicken skin-side up on the grill grates or in a roasting pan. Cook for 35 to 40 minutes, flipping once halfway through. Brush generously with the reserved marinade during the last 10 minutes of cooking. The chicken is done when it reaches an internal temperature of 165°F and the skin is crispy with light char marks.
06 - Remove chicken from heat and let rest for 5 minutes to allow juices to redistribute. Carve into pieces or serve whole if using pieces. Garnish with fresh parsley and accompany with lemon wedges for squeezing over the chicken.