In a large bowl, stir together sweet potato, brown sugar, eggs, cream, cinnamon, and salt until well combined. Spoon into an 11x7-inch baking dish.
Bake until just set, 45 to 55 minutes. Sprinkle with marshmallows and pecans; bake until top is lightly browned, about 10 minutes more. Let stand for 10 minutes before serving.
Recipe by Paula Deen Magazine at https://pauladeenmagazine.com/classic-sweet-potato-casserole-recipe/