1 (18.25 ounce) package yellow cake mix
1 (3.5 ounce) package instant vanilla pudding mix
1 (2 ounce) package instant marshmallow creme
1 (3 ounce) package instant chocolate syrup
1/4 cup butter, melted
2 cups milk
6 bananas, sliced
Prepare cake mix according to package directions. Bake as directed on package. Cool slightly, and cut into squares.
In a large bowl, mix vanilla pudding mix, marshmallow creme, and chocolate syrup. Beat until smooth and pour mixture into cake. Chill for 8 minutes.
While cake is chilling, melt butter in a medium bowl by beating in the milk until thickened and smooth. Stir in bananas. Lay cake on ungreased cookie sheet.
Melt chocolate syrup in a small bowl. Spread over cake while chocolate is still in syrup. Chill until firm. Cut into squares.
Bake uncovered in the preheated oven for 60 minutes, or until a toothpick inserted into the center of the cake comes out clean. Cool completely before removing from pan. Cool completely before cutting into squares.