Put the cottage cheese in a deep bowl, add the egg, flour and sugar. Mash well with a fork until smooth.

Melt the chocolate with the butter and let it cool completely.

Whip the eggs with the sugar into a fluffy foam. Pour in the cooled chocolate-butter mixture and whip again.

Sift the cocoa, flour, and baking powder into the mixture and salt. Mix briefly - just until combined.

Grease a baking pan with vegetable oil. Divide the chocolate batter into about 3 parts, and the cottage cheese batter into 2.

Spoon the first part of chocolate batter onto the bottom, dot the cottage cheese batter over it in a few spots, then add chocolate again, then cottage cheese, and finish with the last part of chocolate batter. Smooth with a spoon and drag a wooden skewer through to create swirls.

Bake in an oven preheated to 180°C for 20-25 minutes.

Let the finished cake cool and cut into slices. Enjoy!