Black Bean and Corn Casadilla

• 2 teaspoons olive oil
• 3 tablespoons finely chopped onion
• 1 (15.5 ounce) can black beans, drained and rinsed
• 1 (10 ounce) can whole kernel corn, drained
• 1/2 tablespoon brown sugar
• 1/4 cup salsa
• 8 (8 inch) Wheat flour tortillas
• 1 1/2 cups low fat cheddar cheese 

1. Heat oil in a large saucepan over medium heat. Stir in onion, and cook until softened, about 2 minutes. Stir in beans and corn, then add sugar and, salsa. Mix well. Cook until heated through, about 3 minutes.
2.  Place a tortilla on grill, sprinkle evenly with cheese, then top with some of the bean mixture. Place another tortilla on top, cook until golden, then flip and cook on the other side. Repeat with remaining tortillas and filling.