Step 1

Preheat oven to 375 degrees F. Coat a 9- x 13-inch baking dish with cooking spray.

Step 2

In a large bowl, combine ground chuck, onion, bread crumbs, egg, garlic powder, salt, and pepper; mix well. Form into 6 oval patties and place in baking dish.

Step 3

In a medium bowl, combine mushrooms and gravy, then pour over patties.

Step 4

Bake uncovered 40 to 45 minutes, or until no pink remains.