Weeknight Patty Melts

Ingredients

• 1 tablespoon butter
• 1 large yellow onion, thinly sliced
• 1/8 teaspoon salt
• 1 pound ground beef
• 1 teaspoon salt
• 1/2 teaspoon fresh ground black pepper
• 1 teaspoon Worcestershire sauce
• 1/2 teaspoon garlic powder
• 1/2 teaspoon onion powder
• 2 tablespoons butter, softened
• 8 slices sandwich bread, of your choice
• 8 slices Swiss cheese