It's fun to use pistachios for some of these and pecans for others, but of course you can stick with one or the other. It's best to bake them on a dry day; if it's even slightly humid, the meringues may take longer to crisp in the oven. The meringues can be made up to five days ahead and stored in a cool, dry place.
This quick and easy recipe for rich chocolate treats comes from Faith Durand, Executive Editor of The Kitchn, from her book Bakeless Sweets. They have a pleasantly nutty flavor, with crisp bits of crushed cracker and chopped hazelnut mixed in -- and you can put them together in just a few minutes.