Dixie's Sweet Potato Casserole with Marshmallows and Coconut Crumble

Preheat oven to 425 degrees F. Meanwhile, on an ungreased baking sheet, arrange sweet potatoes (prick the large ones with a fork first). Bake until tender, 45 minutes to 1 hour. Set aside to cool. Meanwhile, reduce oven temperature to 350 degrees F. Coat two 8-inch square casserole dishes with cooking spray and set aside. Peel cooled potatoes and, in a large bowl, mash with a fork. Add evaporated milk, condensed milk, eggs, melted butter, 1 cup light brown sugar, cinnamon, vanilla, allspice, nutmeg, cloves, ginger, and salt; stir to combine. Divide mixture between the prepared casserole dishes. To make the crumble, in a medium bowl, combine pecans, coconut, flour, and remaining butter and light brown sugar until crumbly. Crumble the mixture evenly atop both dishes of sweet potatoes. Top with marshmallows. Bake until marshmallows are deep golden brown, 30 to 45 minutes.