Veggie burger ingredients will hold together better if they have been refrigerated before cooking. If they are not refrigerated, the ingredients will dry out and cause the burgers to fall apart. Freeze veggie burgers that are especially fragile before frying or grilling. Fry the burgers in a non-stick pan with a little bit of olive or vegetable oil. Another option is to take leftover grilled vegetables and turn them into veggie burgers by adding mashed beans and breadcrumbs.
Broccoli burgers are another take on the veggie burger.
Start by blending two eggs together in a bowl. Add salt and pepper for additional flavor. Form into patties and bake on a greased baking sheet at 375 degrees for about 25 minutes. Flip halfway through baking. Portobello mushrooms make a delicious veggie burger.