Put one banana at a time in the butter sugar mixture. Mix well and then add the next banana. (If you have small bananas add three. If you have large bananas add two).
Once all bananas are added, beat for 2 minutes.
Add eggs one at a time.
Sift dry ingredient together.
Add a portion of dry ingredients and then a portion of buttermilk to batter. Keep adding the dry ingredients and buttermilk until all is incorporated. If you think the cake batter is too thick, add another 1/3 cup of buttermilk.
Spray a large cookie sheet with a lip on it (18 x 26 in.) with vegetable spray. You can also make this in a 13 x 9 pan.
Bake for 25 minutes until top is light brown.
Cool cake completely and then frost with cream cheese frosting.
Cream Cheese Frosting
Mix cream cheese and butter until creamy.
Gradually add powdered sugar.
Add a little heavy cream to create the consistency you are looking for.
Beat the frosting for four minutes once everything is added to make it light and fluffy.