In a large mixing bowl, combine the mashed bananas, rolled oats, peanut butter, honey or maple syrup, vanilla extract, salt, and cinnamon. Mix until all ingredients are well incorporated.

If using chocolate chips or dried fruit, fold them into the mixture until evenly distributed.

Refrigerate the mixture for about 30 minutes to help it firm up, making it easier to shape into balls.

Once chilled, use your hands to scoop out small portions of the mixture and roll them into balls, about 1 to 1.5 inches in diameter.

Place the oatmeal balls on a parchment-lined baking sheet. Continue rolling until all the mixture is used up.

Store the oatmeal balls in an airtight container in the refrigerator for up to a week or freeze them for longer storage.