Separate the whites from the yolks. We start whipping the proteins at the smallest mixer speed. Slowly, add sugar and vanilla one spoonful. When the protein mass becomes white and fairly dense, add the yolks along the spoon while continuing to beat. Remove the mixer and begin to sift the flour into the bowl with the proteins, gently kneading the spoon in the direction from the bottom up .Pour the finished dough into a greased mold and send it to the oven preheated to 190-200 degrees for 20-25 minutes. The main rule when baking a biscuit is to not open the oven door - otherwise it will fall off. I also ordered my household not to stomp in the kitchen and not to speak loudly. When the time comes, we take out the form and turn the biscuit on a plate (wire rack, towel) and let cool.