Rinse the chickpeas thoroughly, then mash them with a fork or using an immersion blender.
Grate the carrot and zucchini. Finely chop the red onion and garlic.
In a bowl, combine the mashed chickpeas, grated vegetables, chopped onion and garlic, rolled oats, flour, and spices. Mix well to combine, then let the mixture stand for 10 minutes to allow the oats to absorb some of the moisture.
Form the mixture into four equally sized patties. In a skillet over medium heat, cook the patties for 3-4 minutes per side in a little olive oil, until golden brown.
Halve the hamburger buns and lightly toast the cut sides in a dry skillet.
Spread a little vegan mayonnaise on the bottom bun, top with a lettuce leaf, then add the vegetable patty. Add thinly sliced tomato, and finish with the top bun.
Serve the prepared burger immediately. Serve with sweet potato fries or other side dishes.
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