Mexican Chicken Taco Casserole
1 (14 ounce) can tomato sauce 1 (15 ounce) can black beans, drained 1 (15 ounce) can diced tomatoes and green chi… 1 (15 ounce) can whole kernel corn, drained 1 medium onion, diced 1 pound ground chicken 1 tablespoon olive oil 2 cups shredded Mexican blend cheese 2 teaspoons chili powder 2 teaspoons cumin 2 teaspoons garlic powder 7 (6 inch) flour tortillas, or as needed nonstick cooking spray ½ teaspoon salt