INGREDIENTS
2 tbsp
butter
2 tbsp
all-purpose flour
1 1/2 cups
whole milk
1/2 tsp
salt
1/2 tsp
ground black pepper
nutmeg
1 tbsp
whole grain Dijon mustard
8
slices thick-cut sturdy white sandwich bread
6 oz
sliced ham
1 cup
grated Gruyère cheese + 1/2 cup for topping
1/4 cup
grated Parmesan cheese
1 tbsp
melted butter