Nacho Cheese Casserole

Name: Nacho Cheese Casserole
Ingredients: 3 tablespoons vegetable oil; 3 tablespoons all-purpose flour; One 28-ounce can enchilada sauce; One 10-ounce can enchilada sauce; 3 cups chicken broth; 1/2 teaspoon ground cumin; Kosher salt and freshly ground black pepper; 3 pounds ground beef; 2 cloves garlic, minced; 1 medium onion, finely chopped; 1/2 teaspoon kosher salt; Nonstick cooking spray, for the baking dishes; One 15-ounce bag nacho cheese-flavored chips, such as Doritos; 2 cups shredded pepper jack cheese; 2 cups shredded Cheddar cheese; 1 1/2 cups shredded romaine; 3 Roma tomatoes, diced; 1/2 cup sour cream; 1/4 cup sliced black olives; 3 green onions, sliced