Wash and dry the mushrooms. Break off the leg very carefully so as not to damage the cap. If you are used to cleaning champignon caps, you can do it, I miss this moment, as I always simplify my work in the kitchen. Put the mushroom caps in the form in which you plan to bake them.
Peel the peanuts, and if yours is not fried, then fry. I buy peeled and roasted nuts. Also, let me remind you that you can use any nuts, even pine nuts, it all depends on your financial capabilities.
Pour each mushroom with mayonnaise, which can be replaced with sour cream.
Grate the cheese on top (it is better to use small or medium-sized cloves of the grater since the mushrooms themselves are small).
In an oven preheated to 180 degrees, send the mushrooms to bake for 20 minutes. They cook very quickly, so do not miss the time, otherwise, the mushrooms may become dry.