INGREDIENTS
1 lb
Ground beef chuck
1/2 tsp
Garlic powder
1/4
Onion, small
2
Onions, large
1 tbsp
Ketchup
8 tsp
Mayonnaise
1/4 tsp
Black pepper, freshly ground
1 tsp
Kosher salt
3 tbsp
Vegetable oil
8
slices Rye bread
4 oz
Cheddar, aged sharp
4 oz
Swiss cheese