Dried shiitake mushrooms are loaded with guanylate, which teams up with the glutamate in nutritional yeast and nori to produce an over-the-top umami seasoning that is ready to elevate popcorn for movie night at home, which we’re doing a lot more of these days. Once you taste it, you’re going to want to sprinkle (or perhaps pour) this magic mushroom powder on everything, including roasted or steamed vegetables, baked potato, grilled fish, soups, pasta, and avocado toast. Luckily, it keeps well. You can also make it with dried porcini mushrooms.