INGREDIENTS
2 media
yellow onions
2 tbsp
olive oil
2 tbsp
unsalted butter
1 tsp
sea salt
1/2 tsp
black pepper
16 oz
cooked elbow macaroni
1/2 cup
unsalted butter
1/2 cup
flour
2 cups
whole milk
1 cup
beef stock
2 tsp
salt
1/2 tsp
ground mustard
1/4 tsp
garlic powder
1 cup
gruyere cheese
1/2 cup
shredded mozzarella cheese
2 cups
rotisserie chicken
1 serving
salt and pepper
1/4 cup
gruyere cheese
1 serving
thyme