INGREDIENTS
4
Chop house by holten angus sirloin steak burgers
1/4 tsp
Garlic powder
2
Sweet onions, large
2 tbsp
Ketchup
1/3 cup
Mayonnaise
1/2 tsp
Mustard, yellow
1/4 tsp
Black pepper, ground
8
slices Sourdough or rye bread, thick cut
8 tbsp
Butter, unsalted
4
slices Cheddar cheese, medium
4
slices Swiss cheese