Generously spiced with cinnamon, ginger, cloves, and nutmeg (also known as Pumpkin Pie Spice), this vegan buttercream is the perfect pairing for my Pumpkin Gingerbread Loaf, or any of your go-to fall baked goods. To the bowl with the butter, add the pumpkin pie spice (start with 2 teaspoons), vanilla, and a small pinch of salt. Store-bought pumpkin pie spice works great, or for a homemade version of pumpkin pie spice, see my Pumpkin Pie Spice.