INGREDIENTS
12
slices Bacon, thick-cut
1/4 cup
Dijon mustard
1 cup
Mayonnaise
1/2 tsp
Black pepper, freshly ground
1 1/2 tsp
Kosher salt
1
loaf Sourdough bread
6 tbsp
Butter, salted
6 oz
Cheddar, sharp
6 oz
Gruyere or swiss cheese
1/4 cup
Parmesan cheese, grated