Mash bananas and set aside.
Combine cake mix, oil, milk, eggs and mashed bananas and beat on low speed for 1 minute, until combined.
Beat at medium speed for 3-4 minutes.
Gently fold in chocolate chips and hazelnuts.
Pour into 2 greased and floured 9 inch cake pans. Bake at 350 degrees for 30-35 minutes.
Not a NESTLÉ®-tested recipe.