Creating an Epic Patty Melt

Ingredients

• 1 lb medium ground beef
• 2 medium medium onions, sliced
• 4 tbsp unsalted butter, divided
• 2 tbsp olive oil
• 1 tsp salt
• 1 tsp ground black pepper
• 2 tsp Italian seasoning
• 1 tsp garlic powder
• 1 tbsp Worcestershire sauce
• 2 tbsp ketchup
• 4 large slices of rye bread
• 3 tbsp mayo
• 8 medium slices of Swiss cheese