Peel the potatoes, cut into small pieces and boil in lightly salted water until tender (15-20 minutes, or until tender).
Then drain the water and mash the potatoes in mashed potatoes with a potato grinder. Season with salt and pepper. If necessary, you can add a little warm milk for a fluffier puree.
Heat-resistant molds, 4-6 pieces with a volume of 280-300 ml (or one mold with a volume of approximately 1.5 liters), grease with vegetable oil. Place the tins on a baking sheet and fill them with mashed potatoes.
Turn on the oven to preheat to 180 degrees. Beat the cream with a mixer until “soft peaks”.
Add grated cheese to the cream, stir and put this mixture on top of the potatoes.
Place in a preheated oven and bake for 15-20 minutes, until lightly browned.
Sprinkle the finished mashed potato casserole with chopped green onions. If desired, you can add to the mashed potatoes to taste: fried onions or garlic, chopped herbs, horseradish or mustard, pieces of blue cheese or fried bacon, etc.