Combine the cottage cheese with the oil and sugar, stir and add the eggs one by one. Add the flour, carrots and walnuts (set aside a little for declaration).
Pour the dough into a cake form, smooth it out and bake an hour and a half at 356°F (180°C). Prepare a cream by beating the butter with 1 tablespoon powdered sugar. Add the cream cheese and stir everything.
While stirring non-stop, add the remaining powdered sugar. Remove the baked dough from the oven and let it cool. Separate it from the form, smear it with cream and sprinkle on walnuts.