In a medium bowl, whisk together the olive oil, lime juice, apple cider vinegar, and honey until well combined.
Add the chili powder, cumin, garlic powder, onion powder, smoked paprika, salt, black pepper, and cayenne pepper (if using) to the bowl. Whisk until all the spices are fully incorporated.
Place the chicken breasts in a large resealable plastic bag or a shallow dish. Pour the marinade over the chicken, ensuring all pieces are well coated.
Seal the bag or cover the dish and refrigerate for at least 1 hour, or up to 8 hours for maximum flavor.
Preheat your grill or skillet over medium-high heat. Remove the chicken from the marinade and discard the remaining marinade.
Grill or cook the chicken for about 6-7 minutes per side, or until the internal temperature reaches 165°F.
Let the chicken rest for 5 minutes before slicing or shredding. Serve in tacos with your favorite toppings.