Add the olive oil, garlic, honey, cumin, chopped chipotle peppers (with a little adobo if desired), orange juice, and a pinch of salt and pepper to a food processor or blender.
Pulse until the marinade is smooth and well combined.
Place the chicken breasts in a shallow dish or resealable bag and pour the marinade over them, coating evenly.
Marinate in the refrigerator for at least 2 hours or up to overnight for best flavor.
When ready to cook, remove the chicken from the marinade and discard the excess marinade.
Preheat a grill or grill pan to medium-high heat and oil the grates or pan lightly.
Grill the chicken until it reaches an internal temperature of 165°F (74°C), about 6–8 minutes per side depending on thickness; use a meat thermometer to check doneness.
Transfer to a plate, let rest a few minutes, then serve.