Queso Blanco Ingredients 1 tablespoon olive or vegetable oil 1/4 cup white onion, diced 1 large jalapeno or serrano, seeds and stem removed; diced 16 ounces white American cheese, shredded or cubed 4 ounces Monterrey Jack cheese, shredded 3/4 cup cream or half-and-half 1 (10 oz.) can diced tomatoes and green chilies 1-2 Roma