This chicken is delish, and so versatile. Serve as a meal, fajitas, bowls, or sandwiches.
Combine first seven ingredients, the lime zest and juice, Worcestershire, olive oil, sugar, garlic, chipotle or cayenne pepper and the pinch of red pepper flakes in a Ziploc or medium bowl and mix together. Add chicken, massaging & turning to coat. Refrigerate for 15 to 30 minutes. (May be marinated overnight, and it is flavorful, but the heat will dissipate with the longer time period.)
Prepare barbecue (medium-high heat). Remove chicken breasts from marinade, letting excess drip off. Grill chicken until just cooked through, turning occasionally, about three to five minutes, depending on thickness of breasts.
If using cheese, when turning the chicken, place 1 cheese slice atop each chicken breast half; cover barbecue and cook until cheese melts, one to two minutes. Transfer chicken breasts to plates.
Serve with lime & Sweet Cayenne Mustard Sauce.
*notes: