Nov 8, Classic Sweet Potato Casserole with marshmallows and toasty This recipe makes quite a large casserole so if you are only serving your. Serve up this sweet potato casserole from Martha Stewart made with mashed sweet potatoes and a marshmallow Great tips & recipes delivered to your inbox . Nov 19, Any leftovers of this reheat really well too. And there ain't nothing like Thanksgiving leftovers, right? Easy Sweet Potato Casserole recipe from. The Best Sweet Potato Casserole You'll Ever Taste!