Preheat the oven to 170°C / 340°F (top and bottom heat). Line the baking pan with parchment paper and/or grease a 7-inch (18 cm) springform pan.
Make the batter: In a large bowl, beat the butter and brown sugar with a mixer for 5 minutes until creamy. Add the eggs one at a time, then mix in the Greek yogurt, self-rising flour, cocoa powder, and baking soda. Finally, fold in the chopped chocolate pieces.
Bake the layers: Divide one-third of the batter into the prepared pan and bake for 20–30 minutes, until a toothpick comes out clean. Let cool, remove from the pan, and repeat with the remaining batter. Allow all cake layers to cool completely.
Prepare the filling: Make the dream whip chocolate according to the package instructions.
Assemble the cake: Place one cake layer on a cake stand or turntable. Spread a generous layer of cream filling on top, then place the next cake on top. Repeat and finish with the final cake layer. Chill the stacked cake in the refrigerator until firm.
Frost the cake: Cover the outside of the cake with a thin layer of Dream Whip.
Add the drip: Pour the melted chocolate into a piping bag or squeeze bottle and carefully create a drip effect around the edge of the cake. Let it set in the fridge.
Decorate: Pipe 8 swirls on top of the cake using a piping bag fitted with a Wilton 2D tip. Add a cake topper if you like. Enjoy!
Good to know:
Dream whip is an option for decorating the cake. You can also use a buttercream of your choice.