Lightly mash bean mix with capsicum, chopped shallot and cheese in a small bowl.
Top a pita with baby spinach and bean mix; place remaining pita on top and toast in sandwich press for 1–2 minutes, or until cheese is cooked to your liking.
Combine avocado, tomato and coriander (if using) to make salsa. Cut cooked quesadilla in half or into quarters; serve with tomato salsa and sour cream.