Get out and measure your ingredients.
Peel and slice bananas.
Add to a bowl and lightly mash the bananas with a fork and set aside.
In a medium sized mixing bowl combine cane sugar, cinnamon, vanilla extract, cream cheese, sour cream, powdered sugar, and butter flavoring. Using a whisk, stir until smooth.
Add bananas and gently fold bananas in with a spatula until blended but not smooth. Do not over mix.
Place the mixing bowl into the freezer for 20 minutes to allow the mixture to slightly harden. This will make it easier to form the egg rolls.
Add ¼ cup of banana filling into the center of each egg roll wrapper in a diagonal line. Fold in both of the corners over the filling, then fold one side over the filling and tightly roll to the other side. Repeat until all egg rolls are finished. If the filling is too soft, place it back into the freezer for 5 minutes. I found it was easier (and less messy) to work with the filling if it was partially frozen. If you are in a pinch for time you could form the eggrolls right after the filling is ready. We tried both ways and the final result was the same.
Whisk egg and 1 tablespoon of water in a small bowl.
Brush the egg rolls with egg wash.
Sprinkle with brown sugar, if desired.