This makes a very dense cake. The batter looked like normal cake batter until I split it and added the cocoa powder and the peanut butter. The batter with the cocoa became very dry, and the batter with the peanut butter became very thick. When I poured it into the cake pan (I did a 9 inch round), it looked more like cookie dough than cake batter. Consequently, I couldn't do the knife swirl very well, so it was more like patches of chocolate within the peanut butter. It was a good cake, but I wouldn't make it for friends.