Sweet Potato Gratin

Sweet Potato Gratin was pinched from <a href="http://www.pauladeen.com/recipes/recipe_view/sweet_potato_gratin/" target="_blank">www.pauladeen.com.</a>
INGREDIENTS
Nonstick cooking spray
2 tablespoons olive oil
5 cups sliced onion
3 tablespoons dark brown sugar
1/4 teaspoon cayenne pepper
1/3 cup butter
3 tablespoons all-purpose flour
2 cups half-and-half
1 teaspoon Dijon mustard
1/2 teaspoon smoked paprika
1/2 teaspoon ground black pepper
1 1/2 teaspoons salt
3 pounds peeled, very thinly sliced sweet potato
2 cups grated Parmesan
2 tablespoons chopped fresh parsley, optional
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