• Mix ground beef, egg, garlic powder, salt, & pepper in a large bowl. Form 6 patties that are 5 inches wide and 1 inch thick. Put a slight indentation in the center of the patties to prevent bulging while cooking.
• Preheat the grill to 450° F and cook the patties for 9 minutes, flipping them halfway through cooking. Alternatively, cook the patties on an indoor grill or stove top until the internal temperature reaches 160° F.
• Quickly toast the insides of the buns until golden brown.
• Heat fried onions in the microwave for half a minute.
• Assemble the burger by layering the beef patties with the cheese sauce, fried onions, and bacon. Optionally, add lettuce or tomatoes.

Cheese sauce

• In a sauce pan, make a roux by melting the butter and stirring in the flour. Cook for 1 minute while stirring.
• Pour in the milk and whisk as the milk thickens. Add the salt.
• Remove from heat and add the shredded cheddar cheese. Stir until the cheese is melted.