INGREDIENTS
6
Chicken breasts, skinless boneless
1/2 tsp
Garlic powder
1 1/2 tbsp
Mustard, whole grain
2 tbsp
All-purpose flour
1
Kosher salt and freshly ground pepper
3 tbsp
Butter, unsalted
1 1/2 cups
Cheddar cheese, grated sharp
1/2 cup
Parmesan cheese, grated
3/4 cup
Whole milk