Preheat your oven to 350 degrees and grease a 9x8 baking dish

In a large bowl, combine cocoa powder and butter and microwave for 90 seconds or until butter is melted

Stir until combined and then add the sugar and stir to combine again

Add in the eggs and vanilla extract and stir until the eggs are completely incorporated

Using a spatula, stir in the flour

Fold in the chocolate chips

Pour batter into your prepared baking dish and bake on the center rack for 30-35 minutes.