1. Wash and drain mushrooms. Remove stems. Reserve stems for another use.
2. In medium bowl stir together MorningStar Farms® Meal Starters® Grillers® Recipe Crumbles™, cheese, bread crumbs, onion, water, garlic powder and pepper. Press into cavities of mushrooms. Arrange in 15 x 10 x 1-inch baking pan.
3. Bake, uncovered, at 350°F for about 15 minutes or until browned.