Spinach Feta Burger Today is National Hamburger Day.............let's celebrate!!!! This Spinach Feta Burger is not a traditional burger by any stretch, but that's what makes it great. It expands your burger repertoire........but not your waistline. Bonus.........only 5 ingredients.........that's right 5. Ground chicken, egg,spinach, fresh dill,and feta cheese. You can make them in a flash. You