Avocado Black Bean Quesadillas

Name: Avocado Black Bean Quesadillas
Prep time: 5 min
Cook time: 15 min
Total time: 20 min
Cuisine: American, Latin American, Mexican
Ingredients: 1/2 onion (sliced); 1/2 bell pepper (sliced); 1 tablespoon olive oil; 1/2 cup black beans (drained); 1 tablespoon taco seasoning; 4 medium soft flour tortillas; 2 avocados (peeled, halved, seeded and sliced); 1/4 cup minced cilantro; 1 lime (cut in half); 1 cup light Mexican (Cheddar or mozzarella cheese); oil or cooking spray for grilling