Bake the donuts for about 8-10 minutes. The donuts are done when the tops bounce back quickly when lightly pressed. Cool the donuts in the pan for 5 minutes before gently taking them out to cool on a cooling rack.
In a microwave safe bowl, add the chocolate chips, heavy cream and evenly cubed butter. Heat the mixture for 30 seconds. Stir until mostly combined. Return the bowl to the microwave, heat for another 15-20 seconds. Stir until well combined and glossy.