Tonight, I was thinking I would love to have a nice slice of spice cake for dessert. Trouble is… I did not have a spice cake. Or a spice cake mix. Or the gumption to make a spice cake from scratch for just one piece.  Then I remembered a recipe a dear friend gave me years ago – the 3-2-1 cake and I still had some 3-2-1 cake mix in my pantry! The key to a 3-2-1 cake is to combine 1 angel food cake mix with 1 standard cake mix in a large zip top bag, combining well. Then you simply place 3 tablespoons of cake mix in a microwave safe coffee mug, add 2 tablespoons of cold water and…