Stuffed mushrooms is a favorite hot snack. It is perfect for both holiday and everyday table. As a rule, mushrooms are stuffed with vegetables, cheese, minced meat or seafood. Today we will prepare stuffed mushrooms with boiled chicken fillet and onions stewed in sour cream. As a result, the filling turns out juicy and aromatic, and looks like a classic julienne. During baking, hard cheese melts and forms an appetizing golden crust on the mushrooms. You can vary this version of the filling with fresh vegetables, pickled cucumbers or garlic.