INGREDIENTS
1
Yellow onion, small
1/2 cup
Puffed-rice cereal, gluten-free crisp
1 tsp
Dijon mustard
3/4 lb
Gluten-free penne
2 tbsp
Potato starch
1
Salt and ground pepper, Coarse
3 tbsp
Butter, unsalted
1
Butter, unsalted
3/4 lb
Cheddar
1 oz
Parmesan, grated
2 cups
Whole milk