INGREDIENTS
1 tbsp
Flat-leaf parsley
1 lb
Sweet potatoes
1/2
Yellow onion, medium
1 cup
Chicken stock, low-sodium
1 tbsp
All-purpose flour
1 pinch
Nutmeg, ground
1/3 cup
Whole-wheat bread crumbs
3 tbsp
Butter, unsalted
3/4 cup
Gruyere, grated
1/3 cup
Parmesan, grated