Prepare the mushrooms. Cut the cleaned champignons into small pieces. Heat the frying pan, pour in the vegetable oil and put the mushrooms in. Fry and remove from the heat.
Grate the potatoes, squeeze them out and put them in a bowl.
Prepare the onion. Cut the onion into small cubes and the green onion into thin rings.
Add fried mushrooms, onions and green onions to the potatoes. Then beat in the egg, add flour, salt and pepper. Mix thoroughly until smooth.
Line a baking sheet with parchment paper. Place the pancakes on the pancakes using a spoon, making them thin (about 1 cm thick). Bake the pancakes for 20 minutes.
Place the finished potato pancakes on a plate and serve with sour cream and herbs. Enjoy!