If using raw sunflower seeds, start by toasting the seeds. Preheat the oven to 325°F. Spread the seeds on a baking sheet and toast for 8 minutes or until lightly golden. Set aside.
Meanwhile, add your ground flax seeds in a small bowl with 4 tablespoons of water to make your flax egg. Stir together and let it thicken while you prepare the other ingredients.
Heat 1 tablespoon of oil in a large non-stick pan over medium heat. Add the onions and garlic and sauté for 5 minutes or until fragrant.
Add the prepared mushrooms to the saucepan with the onions and garlic. Cook for another 5-8 minutes, stirring occasionally.
Add the soy sauce, salt, oregano, thyme and garlic powder. Cook for another 2-3 minutes. Turn off the heat and set aside.
In a food processor, add the toasted sunflower seeds, black beans, mushroom mixture, nutritional yeast, flax egg (flax and water mixture) and panko bread crumbs. Process until combined, leaving some texture from the black beans and seeds.
Form 6 patties and cook them using your preferred method.