1. Saute mushrooms and onion in olive oil in large saucepan for 3 to 4 minutes. Add water and cover with lid. Simmer another 3 to 4 minutes. Remove lid and add steak sauce.
2. Prepare veggie burgers according to package directions.
Serve burger on bun with warm topping.
ON THE GRILL:
Preheat grill
Use a food thermometer to be sure patties reach minimum internal temperature of 165 degrees F.
Note: Recipe is vegan only if vegan steak sauce and Morningstar Farms® Grillers® Vegan Veggie Burgers are used.