In a medium frying pan add: mushrooms, onions, onion powder, and garlic granules sautéing until tender and all liquid has dissipated. (if you need to add water to the pan to sauté just add a small amount to keep from sticking.

In a food processor add all the above ingredients, including the cooked mushrooms and onions, leaving the tapioca starch out, and process until combined.

Pour from processor into a mixing bowl and add the tapioca starch and incorporate evenly with your hands or a spoon.

Make into patties and brown on both sides then place the patties on a parchment covered cookie sheet and bake at 350°F for about 20 minutes.

Remove from oven and serve warm.

Note: Got to serve this one with a nice dill pickle. This burger taste like it was just grilled!