Preheat oven to 350°. Spray bundt pan with baking spray. Place 1 cup chocolate chips in small bowl. Sprinlke with 2 tablespoons dry cake mix, toss to coat. Set aside.
Stir remaining cake mix with dry pudding mix. Prepare cake according to instructions on box, EXCEPT replacing water with chocolate milk. When combined, gently stir in reserved chocolate chips and mix.
Spread in prepared bundt pan and bake 40-45 minutes or until toothpick inserted into the middle comes out clean. Cool in pan 5 minutes. Invert onto cake plate or plater and remove pan, cool completely.
Chocolate Ganache
Place 1/2 cup chocolate chips in a microwave safe bowl or measuring cup. Pour cream over top. Microwave for 30 seconds at 50% power, stir. Repeat as necessary until ganache is smooth.
Place in refrigerator, stirring occasionally, until thickened. Drizzle over cooled cake. Top with additional chocolate chips and sprinkles.