I had a huge zucchini and home prepped frozen chickpeas, so I set out to make a burger that would withstand the simple bite test. And I think I nailed it.
(I'm sure any shredded veggie would do to replace zucchini, and also the mushrooms. My second time around I used celery instead of mushrooms, the color was lighter but the taste and texture were just fine.
3 Cups shredded zucchini
1 can drained chickpeas (1 and 2/3ish cup of home done)
1 small onion
1 Cup mushrooms
1 TBSP dried dill
1 TBSP dried parsley
2 TBSP soy sauce
3 TBSP nutritional yeast
1 teaspoon salt
1 teaspoon pepper
1 1/2 teaspoons mustard powder
1 1/2 teaspoons tumeric
1 1/2 Cuts oatmeal
1 1/2 Cups gluten flour
Shred zucchini in a large food processor (three cups is 1 - 1 1/2 zucchini depending on the size. (I peeled most of the skin off but not all of it). Add soy sauce, nutritional yeast and spices, chunked onion and mushrooms. Whir. When uniform add the drained chickpeas. Blend well and transfer to a bowl.
Add oatmeal and gluten flour. Stir and then knead the dough until completely uniform and mixed.
Form into 12 patties. Place these on a greased cookie sheet (or two). Bake at 350 for a total of 1/2 hour, flipping halfway through. These can be frozen for later or kept in the fridge for over a week.
I also kept some back and experimented with it in a frying pan to see if it would work as "browned" hamburger. Break it up and keep moving it around in a hot pan and it does indeed.