To Prep: Preheat oven to 350 degrees F and mist a 9x13" baking dish with non-stick cooking spray.
Mix together the cake ingredients until well combined and pour the cake batter into the prepared pan. Bake for 35 minutes, or until a toothpick inserted into the center of the cake comes out clean. Remove from oven and allow to cool.
Add chocolate chips to a heat-safe bowl. Heat up the heavy whipping cream in a saucepan until steaming (but not boiling) and then pour over the chocolate chips. Allow to sit for a minute, then whisk until everything is melted and smooth.
Pour the ganache on top of the cooled cake and spread evenly. Sprinkle the mini chocolate chips on top and allow the frosting to set.
Notes
Nutrition information is provided as an estimate and will vary based on exact ingredients used and serving size.