Preheat oven to 350 degrees F.
Grease your cake pan (or two if you're making a layered cake).
Mix package of cake mix, 1 cup Greek yogurt and 1 cup water. Beat until smooth. Divide into two batches.
Add black food coloring to one batch and stir until color is solid. Pour a tiny bit of one color batter in your pan, then the other in the center. Keep alternating until you have both colors back and forth until you've filled the pan.
Bake as directed on the box.
By attosa from Los Angeles, CA
I love this idea it looks delicious!
This is a fun dessert, but it is NOT low in calories! You can use a sugar-free mix, though, and reduce the calorie count some.