Cooking spray
1 cup thinly sliced onion
5 garlic cloves, minced
2 cups shredded cooked chicken breast
1 (15-ounce) can black beans, rinsed and drained
1 cup fat-free, less-sodium chicken broth
1 (7 3/4-ounce) can salsa de chile fresco (such as El Pato)
15 (6-inch) corn tortillas, cut into 1-inch strips
1 cup shredded queso blanco (about 4 ounces)