Preheat oven to 350°F.
In a large bowl mix together, using a hand mixer or whisk, the butter and sugar until it's combined.
Mix in the greek yogurt, eggs, and vanilla extract until combined.
Stir in the cocoa powder until dark and chocolatey.
Slowly stir in the flour, salt, and baking powder just until the the batter is moist.
Slowly stir in the chocolate chips.
Pour batter into a 9 inch baking pan sprayed with cooking spray.
Bake for 22-23 minutes. Do not over bake.
Let cool in the pan. Serve.