The secret is two same size measuring cups and working quickly.
You make the simple batter (see recipe links below). Half the batter is vanilla and half is flavored with cocoa powder. I made mine in a 9" pan.
Carefully pour 1/4 cup into the middle of the pan. Don't wait for it to spread. And, hey, don't grab your camera and take photos! I think mine doesn't look like the others because I might have worked too slowly with the photo breaks! :)
Pour another 1/4 cup of the chocolate batter directly into the center of the pan on top of the previous batter. Repeat until you are out of batter.
Okay. I'll be honest with you. I thought the cake was a bit bland in flavor. Next time, I might make it Matcha (Green Tea) and Chocolate. Or, I would add more vanilla extract. However, it is so pretty that the flavor can be overlooked a bit! :)
Recipe and more photos (their cakes look have thinner layers that go all the way to the top):
The recipes are slightly different.
I used this one: Connie Veneracion's Home Cooking Rocks!
Great step-by-step photos: Farida’s Azerbaijani Cookbook