These were terrific and I changed a few things: no egg, added ½ cup shredded mozzarella, used 2 cups fresh spinach instead of 1 cup frozen, and made 12 mini patties. These are perfect for breakfast grab & go.
Second time (next day)...doubled the recipe with changes above and also added a link and a half (casing removed) of mild Italian sausage. These were even better!