BBQ Chicken Quesadilla

Name: BBQ Chicken Quesadilla
Ingredients: Four 12-inch flour tortillas; 1/4 cup grated Cheddar, plus 1/4 cup; 1/4 cup grated queso blanco; 8 ounces cooked boneless, skinless chicken breast, small diced; 1 red onion, thinly sliced; 1/4 cup favorite barbecue sauce; Tropical Fruit Salsa, recipe follows; Cilantro sprigs, for garnish; 1/4 cup small diced mango; 1/4 cup small diced papaya; 1/4 cup small diced pineapple; 1 red jalapeno, minced; 1/2 lime, juiced; Pinch salt