Grilled Onion & Swiss Cheeseburgers

Ingredients

• 4 (1/4lb) Frozen Beef patties
• 1 Yellow Onion, Thinly Sliced
• 1 Tablespoon Olive Oil
• 1/2 Teaspoon Salt
• 1/4 Teaspoon Ground Black Pepper
• 4 Slices of Swiss Cheese
• 4 Hamburger Buns
• Mayo
• Mustard
• Chopped Lettuce

Directions: 

• Preheat a greased grill to medium heat.
• In a bowl, toss sliced onions with olive oil, salt, and pepper.
• Cook onion on grill until they are softened and browned, stirring often, about 10 minutes. Set onions aside while you grill the beef patties.
• Cook beef patties until charred and fully cooked through, about 4-5 minutes per side. Adjust grill temperature as needed. Internal temperature should register 160°F on an instant-read thermometer.
• Top beef patties with Swiss cheese during the last minute of cooking.
• To assemble burgers, add mayo and mustard to buns and fill with lettuce, beef patties with cheese, and grilled onions.