Process the raisin bran and brown rice cereals, peanut butter, maple syrup, cherries and 1 tablespoon water in a food processor until the mixture is finely chopped and comes together in a big ball. Roll some into a small ball; if it seems too dry and crumbly, add 1 more tablespoon water.
Scoop the mixture into slightly mounded tablespoons, then roll them into smooth balls. (Dampen your hands with a little water to help you roll.)
If using the bananas, pulse them in a food processor until finely ground. Pour them into a small bowl. Roll each truffle in the banana dust until coated. If using the cocoa, pour it into a small bowl, then roll each truffle in it until coated.
Store the balls at room temperature in an airtight container for up to 2 days.
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