Combine cinnamon, allspice, garlic salt, thyme, 1/4 teaspoon of salt, black pepper, cayenne pepper and 1 tablespoon of lime juice on a plate; mix to a paste. Brush both sides of chicken with seasoning paste; set aside for 10 minutes to allow flavors to blend.
Meanwhile, combine mango, shallot, jalapeno, cilantro, remaining tablespoon of lime juice and 1/8 teaspoon of salt in a bowl.
Place chicken on preheated grill. Grill for 10 minutes; flip and grill until cooked through, about 6 minutes more. Cut each chicken thigh in half to serve. Yields 3 pieces of chicken (1 1/2 thighs total) and about 1/2 cup of salsa per serving.
*Get crafty with leftovers: If you’re only cooking for 2 people, still make this recipe for 4 servings. Then combine the leftover chicken with 2 cups of arugula and 1 cup of cooked asparagus for an entrée salad another night.