5 large flour tortillas 1 pound lean ground beef ⅓ cup water 3 tablespoons taco seasoning ⅔ cup nacho cheese sauce 4 tostadas or 2 cups tortilla chips ⅔ cup sour cream 1 cup iceberg lettuce shredded 1 cup tomatoes diced 2 cups Mexican cheese blend shredded In a large skillet, cook ground beef over…