Dissolve the yeast in lukewarm cream.
Knead to a dough with the flour, potatoes, butter, egg, egg yolks, and a dash of salt.
Cover and let rise in a warm place.
Roll out on a floured surface and form noodles that are about a finger’s thickness and 3in (7 cm) long.
Heat a good amount of oil in a pan.
Fry the potato noodles in the hot oil until they are golden brown all over.
Remove from oil and let drain on paper towels.
For the vanilla foam, boil the cream, milk, vanilla pulp, and granulated sugar.
Pour into the egg yolks while stirring constantly, then beat in a double boiler until it is nice and creamy.
Place the noodles in dishes, pour the vanilla foam over them, and garnish with fresh blueberries.
Dust with confectioner’s sugar.