Place flax and water in a small bowl. Set aside to thicken.
Place beans in a large bowl. Mash with a potato masher or fork until most beans are broken up. Add breadcrumbs, Boku Superfood, Boku Super Shrooms, Boku Umami, onion powder, garlic powder, cumin, chili powder, smoked paprika, salt, pepper, sriracha, and flax mixture. Stir until well combined.
Form into 6 tightly-packed patties. Preheat a large pan greased with olive oil over medium heat.
Cook burgers for about 6 minutes per side, or until golden brown. Add vegan cheese to patties during the last couple of minutes to melt.
To make the sauce, in a medium-sized bowl combine all ingredients and stir until fully combined. If you would like to thin out the sauce a bit, add water 1 tsp at a time until it reaches your desired consistency.
Serve burgers on toasted buns spread with sauce and desired toppings. Enjoy!