In a large mixing bowl thoroughly mix the above ingredients in the order given. If desired, the mixture can be covered and refrigerated for a few hours for easier handling.
Heat a non-stick pan over medium heat and add olive oil. Form patties with the vegetable mixture as you would for a hamburger.
Take an eighth of a cup of the mixture in the palm of your hand and press it into a three fourth inch thick patty, using your thumb to pack in the sides as you rotate the patty in the palm of your hand, making sure that it is tightly packed. (If the burgers are too dry, add a couple tablespoons of milk.)
Once the oil is hot, place the veggie burgers on the skillet. Cook on each side for about 5 minutes, or until brown.
Serve the veggie burgers as is, on buns with toppings of choice, or with a dollop of salsa.
Notes
The amount of milk and egg whites may vary depending on how moist the mixture is. Add more to bind if the mixture is too crumbly.