Preheat oven to 350°. Spray donut pans liberally with nonstick cooking spray.
In a medium bowl combine the pancake mix, sugar, cocoa powder and baking powder. Whisk or sift dry ingredients to get rid of any lumps in the dry mix.
Add the milk, sour cream, egg and melted butter to the dry mixture and mix to combine. Add mini chocolate chips and stir until they are evenly incorporated into the dough. Spoon dough into a Ziploc bag or piping bag and cut a medium sized triangle from the end of the bag. Pipe enough dough to fill each donut mold about 3/4 full because it will rise while baking.
Once the donuts are cooked through {I like to press down and when it bounces back you know they are ready} remove from the oven and let them cool for a couple of minutes. Then invert them to a cooling rack to cool completely. If there is a spot where the donut is sticking to the pan then just use an offset spatula or knife to break that area loose.
While the donuts are cooling combine the glaze ingredients and whisk until the mixture is smooth and thin enough to dunk your donut into but thick enough to stick onto the donut. Dunk each donut halfway into the chocolate glaze and remove back to the cooling rack for the glaze to set up. Serve or store in an air tight container for a couple of days. They also freeze well for up to 3 months unglazed.