Popular three-layer homemade cake

Dough for one cake layer:
Sour cream - 1/2 cup with a volume of 200 ml;
Sugar - 1/2 cup with a volume of 200 ml;
Chicken egg - 1 piece;
Flour - 3 tablespoons;
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Baking soda - teaspoons.

Fillings:
1st layer - 1 cup of walnuts;
2nd layer - cups of raisins;
3rd layer - cups of poppy seeds.

Cream:
Sugar - 1 cup with a volume of 200 ml;
Yolk - 3 chicken eggs;
Milk - 3 tablespoons;
Butter - 200 grams.

Preparation. Soak the raisins and poppy seeds (separately) in boiling water for 1 hour, then dry them.
Beat the egg with sour cream and sugar, add flour with baking soda. Mix everything thoroughly. Add the corresponding fillings and bake three layers. Bake at 180 degrees for about 30 minutes, until a dry match.
For the cream, mix the yolks, milk, and sugar thoroughly. Over low heat, constantly stirring - cook until thickened (about 7 minutes). Cool the cream to room temperature. Whip the butter until fluffy and add it to the cream. Put the finished cream in the refrigerator for a short time, and then spread it on the cooled layers.