Salisbury Steak with Mushroom Gravy

Ingredients:

1 pound lean ground beef
1 (10-ounce) can condensed cream of mushroom soup, divided
1/2 cup Italian bread crumbs
1 egg, lightly beaten
1/2 cup frozen chopped onions
1 teaspoon steak seasoning
1 tablespoon canola oil
2 tablespoons butter, divided
1/4 cup cognac or brandy
1 (8-ounce) package sliced fresh mushrooms
2 cups low-sodium beef broth
1 (1.2-ounce) packet brown gravy mix
Cooked rice or mashed potato, [...]