INGREDIENTS
1 lb
ground beef
1 small
onion
1/2 cup
bacon
1/4 cup
mayonnaise
1/4 cup
ketchup
1 tbsp
mustard
1 tbsp
pickle relish
2 tsp
onion powder
12 slices
bread
1/2 cup
butter
2 cups
mozzarella cheese
2 cups
cheddar cheese
1 serving
kosher salt and pepper