Press the crust mixture into the bottom and sides of two small tart pans.
Stir together the remaining ingredients until very smooth and spoon into the tart crusts. Put in the freezer to firm.
This is just easy and classic banana ice cream. Allow the frozen bananas to thaw just slightly, and add them and the vanilla to a food processor fitted with an “S” blade. It will take a few minutes, but this will process into a creamy ice cream.
Serve the tarts with a generous portion of ice cream.