Combine half of the milk, yeast, and sugar in a stand mixer bowl.
Let it rise for 15 minutes at room temperature, away from drafts.
Add eggs to the mixture.
Gradually add flour while kneading, incorporating the remaining milk.
Integrate salt until dough is uniform, slightly thicker than pancake batter.
Cover the dough with a cloth, and allow to rise for 30 minutes, stirring at 15 minutes.
Heat a deep skillet with ample oil to 350°F (170°C).
Reduce heat to medium. Dip tablespoons of dough in hot oil.
Fry until golden brown, a few minutes on each side.
Maintain oil temperature at 350°F (170°C) while frying.
Place doughnuts on paper towels to drain excess oil.
Serve hot with cottage cheese, sour cream, jam, or sprinkle with sugar.