Mahogany Broiled Chicken with Smoky Lime Sweet Potatoes and Cilantro Chimichurri

Name: Mahogany Broiled Chicken with Smoky Lime Sweet Potatoes and Cilantro Chimichurri
Ingredients: 1 cup chopped cilantro leaves; 6 tablespoons extra-virgin olive oil; 3 large cloves garlic, minced; 1/2 teaspoon salt, divided; 1/4 teaspoon pepper, divided; 5 tablespoons dark brown sugar; 3 tablespoons Dijon mustard; 2 tablespoons bottled hoisin sauce; 2 teaspoons balsamic vinegar; 1/2 cup plus 1 1/2 teaspoons lime juice, divided; 1 1/2 pounds boneless skinless chicken breast halves, cut in 1-inch cubes; 2 large sweet potatoes, peeled and cut in 1/2-inch pieces; 2 tablespoons unsalted butter; 1 teaspoon chopped canned chipotle pepper; 1 teaspoon adobo sauce (from canned chipotle); 3/4 teaspoon ground cumin; 1/2 teaspoon lime zest; Cilantro sprigs, for garnish