1 1/4 cups root beer
1/4 cup vegetable oil
In mixing bowl,combine the first four ingredients. Beat on low speed for 30 seconds; beat on high for 2 minutes. Pour into a 13 x 9 in baking pan.
Bake at 350 for 35 minutes or until a wooden pick inserted near the center comes out clean. Cool then mix a small package of pudding mix and put it over the cake then bananas on top of that. Then a tub of cool whip.