Sweet Potato Black Bean and Spinach Quesadilla

Name: Sweet Potato, Black Bean and Spinach Quesadilla
Ingredients: 12 oz. small sweet potatoes (about 2), halved lengthwise; 2 tbsp. olive oil; 2 cloves garlic, finely chopped; 1 tsp. ground cumin; 1/2 tsp. ground cinnamon; 1/4 tsp. cayenne; 1 (15-oz.) can black beans, rinsed; 1 bunch spinach, thick stems discarded, leaves roughly chopped; 4 medium tortillas; 6 oz. Monterey Jack cheese; Lime wedges, for serving; Salsa, for serving