I'm planning a waffle brunch for mid-February, with about 20 guests. I'd like to make the waffles in advance, maybe the night before. I'd also like to make a few different flavors; blueberry, chocolate, almond, etc. I found a waffle recipe on epicurious that calls for powdered buttermilk, but I would prefer to use real buttermilk, unless it makes no difference at all. If anyone would like to share a recipe, I'd appreciate it. Also, how should I adjust a recipe to account for different mix-ins, like the blueberries?