Cut the beech mushrooms into bite-sized pieces.
Julienne the onion and green onion.
In a bowl, combine beech mushrooms, onion, green onion, salt, pepper, eggs, and pancake mix. Mix well.
Heat cooking oil in a pan and spread the batter thinly.
Cook on medium-low heat until golden brown on both sides.
Place on kitchen paper to remove excess oil.
Plate the finished mushroom pancakes.