In the bowl of a food processor, combine red onion, parsley, garlic, salt, and oregano until finely minced. Add oats, flour, feta, and sun dried tomatoes until mixture starts to come together into a large ball. Finally, add chickpeas and pulse until just combined, being careful not to overmix.
Divide the chickpea mixture into 4 equal parts (I pictured 6 but prefer 4). Form into patties about ¾ inch thick and arrange on a parchment lined sheet pan.
Heat oil in a large skillet over medium heat. Add patties and cook until golden brown, 4-5 minutes per side. Assemble burgers and serve immediately.
