1 (18.25 ounce) package yellow cake mix
1 (3.5 ounce) package instant banana pudding mix
1 1/2 cups milk
1 1/2 cups white sugar
1/4 cup all-purpose flour
3/4 cup butter
3/4 cup shortening
3/4 cup milk
1 1/2 teaspoons banana extract
Procedures : Preheat oven to 350 degrees F (175 degrees C). Grease and flour 2 – 9×13 inch pans.
In a large bowl, stir together the cake mix and instant pudding. Beat in the eggs and 1 1/2 cup of milk. Divide the batter evenly between the two pans.
Bake in preheated oven for 15 to 17 minutes, or until a wooden toothpick inserted into the cake comes out clean. While the cake is baking, make the filling.
Stir together the sugar and flour. In a medium bowl, cream together the butter, shortening and sugar mixture. Beat in the milk and banana extract until smooth.
When the cake is cooled, invert onto a serving tray. Spread filling over the top and cover with remaining layer of cake. Keep chilled until 1/2 hour before serving.