1chipotle chile in adobo sauce, minced; remove seeds to reduce spiciness (*I actually puree the whole can with adobo sauce & freeze ice cube portions which equal about 1 ½ Tbsp each; I used 1 cube, thawed)
2tspadobo sauce, (if not using the pureed method I just talked about)
In a small bowl combine brown sugar, cilantro, chipotle chile, adobo sauce, salt, chili powder, garlic powder, & pepper. Coat chicken in the mixture, cover & refrigerate for at least 30 minutes & up to 24 hours.
For the dipping sauce, stir all ingredients together in a bowl. Cover & let stand at room temperature for 30 minutes until the flavors combine. Meanwhile cover & soak bamboo skewers; skip this step if using metal skewers.
Pre-heat grill. Loosely weave 3 strips of chicken onto each skewer so that they cook evenly. Place prepared skewers onto a plate, keep as much of the marinade on them that you can.
Grease grill grates with a pastry brush & vegetable oil (may also use a paper towel.) Grill chicken for 5-8 minutes until cooked through, turning half-way. Serve with dipping sauce.