So you can buy the spores online and have them legally shipped to your door basically anywhere in the US from a site sharing it's name with the garden humans first lived in before Eve ate the apple

Once you've got those they grow in a shotgun fruiting chamber, a type of fungus growing that is used for many kinds of mushrooms and is completely normal to talk about.

You take some vermiculite, brown rice flour, and some jars, sterilize the dirt (boil it), put it in jars, and squirt some spores into the jars

Leave them in a drawer to become a full cake, then into the fruiting chamber. Spritz with water 3x daily and in a month you've got more mushrooms than you can cook with

My first harvest was a little over an oz of dried goodness for an investment initially of about $150, and I can do it again at least 2 more times with current supplies