Place the frozen bananas and apples into a food processor. Pulse to break up the fruits until a crumbly mixture is reached. Scrape the sides down as needed, then continuously pulse until a soft-serve consistency is reached. This will take a little time, so be patient.
Once a thick, soft-serve consistency is reached, you can serve as-is or pour into a loaf pan and place in the freezer for at least 4 hours to scoop + serve.
Serve with caramel, cacao nibs, and crushed waffle cones for a tasty treat!