These twice-baked sweet potatoes are seasoned with rosemary, parmesan, and garlic for a savory twist on a sweet potato! Baked until tender and fluffy, the flavorful mixture is whipped, seasoned, and stuffed back into the shells. Top it all with freshly grated parmesan cheese for a simple sweet potato side dish that can be served at Thanksgiving, Christmas, or any other day of the year.