The purist in me would recommend making this cake with this Vanilla Buttercream Frosting Recipe but this chocolate frosting would be equally delicious. Both frostings will make you fall in love with vanilla cake, possibly more than you've ever loved it before. For more frosting options, check out these recipes: Cream Cheese Frosting, Chocolate Sour Cream Frosting, Reese's Frosting, and Poured Chocolate Frosting.