INGREDIENTS
6 oz
Ham
1 tsp
Herbes de provence
2 tbsp
Mustard, whole grain
1/4 cup
All-purpose flour
1
Kosher salt
1/2 tsp
Nutmeg
8
slices 1/2"-thick country-style bread, thick country-style
1/4 cup
Butter, unsalted
3 oz
Gruyere, grated
1 1/2 cups
Whole milk