I don't know what the chef called this, but my kids called it "Chinchilla delight". I had pet chinchillas at the time, and I guess they thought it was weird food. I knew their palette, and knew they wouldn't like the bananas, so I used peanut butter and chocolate chips as the filling. They liked this version.
This morning I had an idea and decided to vary my recipe. It was a BIG hit! I cut up an apple in small chunks, and sauteed it in a little bit of butter. When the apple became softer, I added about 1/3 cup of brown sugar and about 1/2 tsp of cinnamon. I cooked that for a little bit longer to try to carmelize it a little. I used this as the filling for my chinchilla delight. My kids likened it to the apple pies you get at McDonald's. :) Try it, you will like it!