Mix Marinade: In a medium bowl, whisk together olive oil, lime juice, orange juice, soy sauce, Worcestershire sauce, cumin, smoked paprika, chili powder, garlic powder, onion powder, oregano, salt, pepper, and cayenne pepper (if using).
Marinate Chicken: Place 1.5 to 2 pounds of chicken (breast or thigh) in a large resealable plastic bag or a shallow dish. Pour the marinade over the chicken, ensuring it is well coated.
Chill: Seal the bag or cover the dish and refrigerate for at least 30 minutes, preferably 2-4 hours. For the best flavor, marinate overnight.
Cook Chicken: Grill, pan-sear, or bake the marinated chicken until fully cooked and internal temperature reaches 165°F (74°C).
Slice and Serve: Slice chicken into thin strips and serve with sautéed bell peppers and onions, warm tortillas, and your favorite fajita toppings.
Find it online: https://zoominrecipes.com/chicken-fajita-marinade/