23 yukon gold and sweet potato gratin with Recipes

yukon gold potatoes (but russet or white will do will also work), betty crocker au gratin potatoes, chicken broth (or as much as you need to cover the potatoes and vegetables), water, heavy cream, stalks celery (finely diced or put in food processor), baby carrots (cut in bite sized pieces), sweet onion (finely diced or put in food processor), bacon, green onion (to sprinkle on top), margarine, bottled garlic, kosher salt (to taste) or 2 pinches sea salt (to taste), fresh ground black pepper (to taste)

all-purpose flour for dusting, trans fat-free ready-made pie crust, egg white, lightly beaten, heavy cream, reduced-fat milk, freshly grated nutmeg, salt, garlic clove, pepper, yukon gold potatoes (2 large), peeled and sliced into 1/16-inch-thick slices, sweet potatoes (1 large), peeled and sliced into 1/16-inch-thick slices, grated parmesan cheese, unsalted butter , cut into pieces