I've only made this once. But I have another banana waiting in the freezer...
4 very ripe bananas
1/3 cup maple syrup (I use sugar free)
1 teaspoon vanilla extract
Peel bananas, slice, and place in a zip lock bag and freeze overnight, or until very firm.
In food processor blend all ingredients until creamy, about 2 minutes. Serve immediately.
Makes about 3 cups.