Ultimate Patty Melt Diner Perfection at Home - Chef YoYo

Ingredients

• 2 large yellow onions, thinly sliced (approximately 400g/14 oz)
• 2 tablespoons unsalted butter (30g/1 oz)
• 1 tablespoon olive oil (15ml/0.5 fl oz)
• 1/2 teaspoon granulated sugar (2.5g)
• 1/4 teaspoon kosher salt (1.25g)
• 1/4 cup beef broth or water (60ml/2 fl oz)
• 1 pound (450g) ground beef (80/20 blend recommended)
• 1 teaspoon Worcestershire sauce (5ml/0.17 fl oz)
• 1/2 teaspoon garlic powder (2.5g)
• 1/2 teaspoon onion powder (2.5g)
• 1/2 teaspoon kosher salt (2.5g)
• 1/4 teaspoon black pepper (1.25g)
• 4 slices rye bread
• 4 tablespoons unsalted butter, softened (60g/2 oz), divided
• 4 slices Swiss cheese (or Gruyere for a fancier touch)
• Optional: Thousand Island dressing or Russian dressing (for serving)