Preheat your oven to 350°F and spray your mini Bundt pan with non-stick spray.
Using an electric hand mixer, beat the eggs for about 1 minute until frothy. Add the sugar and beat for another minute until fully incorporated.
While the mixer is running, slowly stream in the oil. Then, mix in the sour cream, baking powder, salt, and vanilla extract.
Gently fold in the cocoa powder until mostly combined, then use the mixer to fully incorporate it.
Fold in the flour about ½ cup at a time, avoiding a flour explosion. Once mostly mixed, finish combining with the mixer. Fold in the chocolate chips for that extra chocolatey goodness.
Fill each Bundt pan cup about 2/3 full. Bake for 25 minutes or until a toothpick inserted in the thickest part comes out mostly clean.
Let the cakes rest for 10 minutes before removing them from the pan to cool completely on a wire rack.