INGREDIENTS
6
boneless, skinless chicken breasts
1 1/2 cups
sharp cheddar cheese, grated
3/4 cup
whole milk
1/2 cup
parmesan cheese, grated
3 tbsp
unsalted butter
2 tbsp
all-purpose flour
1 1/2 tbsp
whole grain mustard
1/2 tsp
garlic powder
Kosher salt and freshly ground pepper,