In a large skillet, cook onion in 1 Tbsp. hot oil for 3 to 4 minutes, until softened. Stir in enchilada sauce, pine nuts, raisins, chipotle chile and sauce, brown sugar, vinegar, and cinnamon. Stir in chicken; heat through.
Preheat panini press or cast iron skillet. Brush one side of 4 bread slices with some remaining oil. Turn over; place about 1/2 cup filling on each. Top with 1/4 cup cheese and bread slices; brush with oil.
Place sandwich(es) in panini press and cook for 3 to 5 minutes or until bread is golden and cheese is melted. If using a skillet, toast both sides until golden. Serve with Mango Slaw.
In large bowl whisk together 2 Tbsp. olive oil and 1 Tbsp. lime juice. Add 2 cups finely shredded cabbage, 1/2 cup chopped mango, 2 Tbsp. chopped cilantro, and salt and black pepper to taste. Toss to combine.