In a medium pan, heat olive oil over medium heat, then add onion, carrots, and celery and cook, stirring frequently, until veggies start to soften, 2-3 minutes, stir in the garlic and cook an additional minute; set aside to cool
Add the chickpeas, oats, brown rice, chopped parsley, chia egg, italian seasoning and salt to a large food processor along with the cooked veggies.
Pulse 3-4 times, until the mixture is coarse but not pureed
Divide the mixture into 4 equal portions, and shape each into a small patty
Heat a large greased skillet over medium high heat, and cook the patties 4-5 minutes each side, or until golden brown and cooked through
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