Gather the ingredients.
Add the sliced mushrooms, olive oil, and salt, and pepper to a small sauté pan. Heat on medium high heat, stirring occasionally until the mushrooms have browned and softened.
Remove the mushrooms from the pan and add them to your food processor. Add the rice, tempeh, oats, beets, nutritional yeast, garlic powder, onion powder, steak sauce, vegetable bouillon, and liquid smoke if you are adding. Process until completely ground with mostly small pieces. Continue to pulse until there are no large pieces. It should look like ground beef.
Form the “meat” into four balls and form each of those balls into a patty. Place them on parchment paper while you wait for your griddle to heat up.
Heat a griddle or sauté pan on medium-high heat. Add the oil and then the patties. Cook for 2 to 3 minutes per side or until golden brown on both sides and heated through.
Remove the patties from the heat and serve on toasted buns with your favorite toppings and condiments.