My husband loves both my grilled cheese and my iron-skillet burgers, so I decided to combine them in this grilled cheese bun burger. He said it was the best meal he ever ate.

Ingredients

• 1 pound lean ground beef (90% lean)
• 2 tablespoons worcestershire sauce
• 1 teaspoon garlic powder
• 1/2 teaspoon salt
• 1/4 teaspoon pepper
• 1 tablespoon liquid smoke, optional
• 1 tablespoon olive oil
• 5 tablespoons butter, softened, divided
• 1 large onion, thinly sliced
• 16 slices american cheese
• 16 slices sandwich bread

Directions

1. In a large bowl, combine beef, Worcestershire sauce, garlic powder, salt, pepper and, if desired, liquid smoke; mix lightly but thoroughly. Shape into four 4-in. square patties.
2. In a large nonstick skillet, cook burgers in oil over medium heat until a thermometer reads 160°, 4-5 minutes on each side. Remove and keep warm.
3. In the same skillet, heat 1 tablespoon butter over medium-high heat. Add onion; cook and stir until tender, 6-8 minutes. Remove and keep warm. Place cheese on 8 bread slices; top with remaining bread. Spread outsides of sandwiches with remaining 4 tablespoons butter.
4. In the same skillet, toast sandwiches over medium heat until golden brown and cheese is melted, 1-2 minutes on each side. Top 4 sandwiches with burgers and onions. Top with remaining sandwiches.