Drain Beans and tomatoes carefully of excess liquid (save for soup).
Fro each quesadilla, spread 1/4 mixture on a flour tortilla, sprinkle on 1/4 cup grated cheese and pinch of cumin and/or cayenne (if desired). Top with another tortilla. Hea in microwave 2 or 3 minutes, or until cheese is melted. =OR= Cook on a griddle or nonstick pan; place quesadilla on hot surface for 2 to 3 minutes, turn carefully, and cook an additional 1 or 2 minutes until the cheese is melted.