In a large skillet, heat 1 tablespoon of olive oil over medium heat. Add the chopped onion and bell pepper, sautéing until softened, about 5 minutes.
Add the minced garlic to the skillet and cook for an additional 1 minute until fragrant.
Stir in the cooked chicken, black beans, cumin, smoked paprika, salt, and pepper. Cook until heated through, about 3–4 minutes. Remove from heat and set aside.
In a clean skillet, heat over medium-low heat. Place one flour tortilla in the skillet and sprinkle ¼ cup of the cheddar and mozzarella cheese on one half of the tortilla.
Spoon ¼ of the chicken mixture over the cheese, then fold the tortilla in half. Cook for 2-3 minutes on one side or until the cheese is melted and the tortilla is golden brown.
Carefully flip the quesadilla and cook for another 2-3 minutes to crisp the other side.
Transfer to a cutting board, slice into wedges, and repeat with the remaining ingredients.
Serve hot with sour cream and salsa on the side.
Notes
Arrange the quesadilla wedges on a large platter, drizzle with a little sour cream on top, and add a sprig of cilantro for color. Serve with colorful salsa on the side for a vibrant touch.