Chicken and Broccoli Alfredo Stuffed Shells

INGREDIENTS

12 oz

box Jumbo pasta shells

2 1/2 cups

cooked chicken (, shredded (I use rotisserie))

1 1/2 cups

fresh broccoli (, steamed and chopped)

3 tbsp

unsalted butter

3 cloves

garlic (, minced)

1 cup

heavy whipping cream

1 1/4 cups

whole milk

2/3 cup

freshly grated parmesan cheese

3/4 cup

shredded mozzarella cheese (, divided)

large egg yolk (, beaten)

salt and freshly ground black pepper (, to taste)