Easy Hamburger Steaks with Onion Gravy (30-Minute Dinner)

Ingredients

• 1 1/2 lb (680 g) ground beef, preferably 80/20
• 1 large egg, lightly beaten
• 1/3 cup (35 g) plain breadcrumbs
• 1 tablespoon Worcestershire sauce
• 2 cloves garlic, minced
• 1 teaspoon onion powder
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 1 tablespoon neutral oil
• 2 tablespoons unsalted butter
• 2 medium yellow onions, thinly sliced
• 2 tablespoons all-purpose flour
• 2 cups (480 ml) low-sodium beef broth
• 1 teaspoon Worcestershire sauce
• 1/2 teaspoon dried thyme, optional
• Salt
• black pepper