Preheat oven to 200 degrees.
Beat the butter with 150 grams of powdered sugar, add one egg. Sift flour with baking powder. Mix everything – the dough is ready.
Put the bottom and sides of the baking mold with dough, put in the oven for 10 minutes, then remove.
Whip sour cream, 50 grams of powdered sugar and vanilla essence to a uniform consistency, add 1 egg, beat everything again. Mix gently with blueberries. Put the ready stuffing in the resulting cake and place it in the oven for 30 minutes, then leave it to cool in the oven turned off.