Step 1

Preheat the oven to 350, and spray a 6" round cake pan lightly with cooking spray.

Step 2

In a medium bowl, whisk together the sugar, vanilla, yogurt and eggs. Whisk very well.

Step 3

On top, add the flour, cocoa, instant espresso, baking soda, and salt. Whisk until combined.

Step 4

Finally, stir in the chocolate chips.

Step 5

Scrape the batter into the prepared pan, and bake on a small baking sheet for 23-25 minutes. A toothpick inserted with have wet chocolate on it, but the top of the cake will appear dry and the edges will start to pull away from the pan.

Step 6

Let cool for 5 minutes, and then carefully tip onto a serving plate.