Prepare the Marinade: In a mixing bowl, whisk together olive oil, white vinegar, lime juice, minced garlic, cumin, chili powder, smoked paprika, oregano, salt, pepper, and cayenne (if using). This blend is what gives the chicken that signature smoky, tangy adobo flavor.
Marinate the Chicken: Place the chicken thighs (or breasts) in the bowl or a ziplock bag. Pour the marinade over the chicken, ensuring every piece is evenly coated. Cover and refrigerate for at least 20 minutes. For a deeper flavor, marinate for at least 8 hours or overnight.
Preheat Your Grill or Pan: Heat a grill pan or outdoor grill over medium-high heat. You want it hot enough to sear the chicken and get those beautiful grill marks.
Grill the Chicken: Place the chicken on the grill and cook for about 7–9 minutes on each side. Use tongs to flip carefully. The chicken is done when it reaches an internal temperature of 165°F (74°C) and has a slight char.
Rest and Slice: Let the chicken rest for 5 minutes before slicing. This keeps the juices locked in, making it tender and moist.
Serve and Enjoy: Serve it hot over rice, in tacos, or on a fresh salad. Add your favorite toppings, such as avocado, fresh cilantro, or a squeeze of lime.