These quesadillas are packed full of goodness including black beans, sweet potato, onions and coriander, these are filling and good for you. The staple ingredient in any quesadilla, cheese, can sometimes be fattening if the quantities are large and they are consumed often. However, a bit of mozzarella or any cheese is actually very good for you! Cheese is a great source of calcium, fat, and protein, and is loaded with vitamins A and B-12, along with zinc, phosphorus, and riboflavin.