This recipe is adapted from a Kraft recipe which I came across in a "Quick and Simple" magazine. You can view the original recipe at the Kraft Food website. In my version, I use a bit more meat and breadcrumbs, and I keep the zucchini peels on when I grate them. (FYI: This guards the vegetable fiber and antioxidants, plus it adds color to the final product, so that the pie is not entirely brown.)
In a large bowl, blend the seasoned ground beef, feta, eggs, milk and bread crumbs. Butter your 9" pie dish. Lay out the store bought pie crust inside it.