1medium yellow onionhalf grated, the other half thinly sliced
1teaspoonfreshly ground black pepper
12slicesAmerican cheeseoptional *
In a medium bowl, combine the beef, egg, grated onion, garlic powder, salt, and pepper. Mix until combined.
Form into thin patties. Spread butter on one side of each slice of bread.
Heat a large heavy skillet over medium-high heat. Cook the burgers about 3 minutes on each side. Drain on paper towels. Drain the grease from the skillet.
In the same skillet, place six slices of bread, butter side down. Top each with a slice of cheese, if desired, some onions and a burger. Top with remaining slices of cheese, if using, and bread, butter side up.
*I used ¼ lb. of beef for each burger and medium cheddar cheese