Sweet Potato Casserole with Pecans and Marshmallows

"My Sweet Potato Casserole with Pecans and Marshmallows is a cross between a side dish and a dessert with its gooey crumb/marshmallow topping. An optional ingredient is to add pineapple tidbits inside the sweet potatoes. This adds a little something extra to the dish. This is such a versatile recipe, you could serve this one for a side dish or as a dessert. The topping really is the star here with a pecan crumble and marshmallows."