Vegan adaptation inspired by the corresponding recipe in Good Lookin' Cookin': A Year of Meals - A Lifetime of Family, Friends, and Food by Dolly Parton and Rachel Parton George. This adaptation uses original wording and plant-based substitutions. The published original makes a large double batch with whole milk, eggs, egg yolks, butter, vanilla wafers, bananas, and an egg-white meringue. This version is scaled to one 9x13-inch dish and uses a starch-thickened soy custard plus aquafaba meringue. Use vanilla wafers specifically labeled vegan.