I can't take credit for this recipe, I found it here and once I took one look at it I HAD to try it myself. Of course I swapped out the semi-sweet chocolate chips for milk chocolate ones because I am a WILD WOMAN but everything else is the same. She calls this cake "ridiculous" and it truly is, and easy! I love love love any recipe that starts with boxed cake. Don't tell anyone but I think doctored boxed cake is better than from scratch in certain cases, especially this one or anything involving funfetti.
INGREDIENTS (recipe is from http://cookiesandcups.com/)
1 (15.25 ounce) box chocolate cake mix
1 (3.9 ounce) box instant chocolate pudding
1 (16 ounce) container sour cream
⅓ cup vegetable oil
½ cup water
2 cups semi-sweet chocolate chips (I used milk chocolate)
¼ cup butter, room temperature
¼ cup unsweetened cocoa powder
2 cups powdered sugar
1 teaspoon vanilla
¼ cup heavy cream
Preheat oven to 350°F. Liberally grease a 10- inch bundt pan with butter or shortening and lightly dust with flour. Set aside.
In the bowl of your stand mixer fitted with the paddle attachment combine all the cake ingredients. Mix on low for 30 seconds until combined and then on medium speed until smooth, about 1 minute. Stir in the chocolate chips and pour the batter into the prepared pan.
Bake for 55-60 minutes, until the cake is set. Allow the cake to cool in the pan for 10 minutes and then invert the pan onto a cake plate. Cool completely before frosting.
In the bowl of your stand mixer fitted with the paddle attachment on low speed beat the butter, cocoa powder and powdered sugar until combined. Add in the vanilla and cream and beat on medium speed for 1-2 minutes until creamy, scraping the sides of the bowl as necessary.
Frost the top of the cake and garnish with more chocolate chips if desired.