Hamburger Steak with Onions and Gravy

INGREDIENTS

• 1 pound ground beef
• 1 egg
• 1/4 cup bread crumbs
• 1/8 teaspoon ground black pepper
• 1/2 teaspoon seasoned salt
• 1/2 teaspoon onion powder
• 1/2 teaspoon garlic powder
• 1 teaspoon Worcestershire sauce
• 1 tablespoon vegetable oil
• 1 cup thinly sliced onion
• 2 tablespoons all-purpose flour
• 1 cup beef broth
• 1 tablespoon cooking sherry