Paula Deen: Easy Sweet Potato Gratin Recipe - Serves 20

Ingredients

• 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 lb peeled, very thinly sliced sweet potatoes
• 2 cups grated Parmesan cheese
• 2 tablespoons chopped, optional fresh parsley