I have never cooked such delicious potatoes! My family asks me to do this every day

Ingredients:
Boil 900g potatoes until done.
Place on a baking tray covered with baking paper.
Salt, pepper, spices for potatoes.
80g melted butter.
60g Parmesan.
Bake at 200°C for 12-15 minutes.
1 small onion.
1 cucumber.
Bunch of green dill and parsley.
120 g sour cream or natural yogurt, a pinch of salt.
Optional 2 cloves of garlic.