Preheat oven to 350 degrees. Place silicone baking mat on baking sheet.
Heat a large skillet over medium heat. Add ~1 tbsp oil.
Sauté onions and mushrooms until tender.
While onions and mushrooms cook, add black beans to a mixing bowl and mash with a potato masher.
When onions and mushrooms are cooked, add it to the bowl of black beans. This should be approximately 1 cup.
Add flaxseed and spices to the mixing bowl. Use hands to mix and form into 6 patties.
Place patties on prepared baking sheet and bake for 25 minutes until golden brown and cooked through.