Preheat oven to 350 degrees. Line a sheet pan with parchment paper.
Add oil to a skillet over medium heat.
Add celery, carrot, onion, garlic and sweet potato to pan. Stir and add cumin, sea salt, and pepper. Cook 5-7 minutes.
Saute until onions start to soften. Add mushrooms and zucchini. Cook, stirring occasionally, until sweet potato is tender. (About 5-10 more minutes.) Remove vegetables from heat and allow to cool.
Pulse vegetable mix in food processor. Stop when the mixture is diced small and uniform in size, but STOP before it becomes a puree. Transfer to mixing bowl and fold in beans. Add back to food processor in small batches and pulse until just combined.
Add additional oats if mixture is too wet. Add 1 egg (and stir) if mixture is too dry or is having trouble sticking together.
Shape into 5-6 oz patties and bake for 10 minutes. Serve warm or pack into freezer bags and flat freeze.