Mash the bananas: In a large bowl, mash the bananas with a fork until mostly smooth with a few small lumps.
Add wet ingredients: Stir in the nut or seed butter, honey or maple syrup, and vanilla until fully combined.
Mix in dry ingredients: Add the oats, cinnamon, and a pinch of salt. Stir well until everything is evenly coated and the mixture starts to hold together.
Fold in mix-ins: Add your chosen mix-ins.
Start with 1/2 cup and add more if the mixture still holds shape. If it gets too crumbly, add an extra tablespoon of nut butter.
Chill the mixture: Cover and refrigerate for 20–30 minutes. This makes rolling easier and helps the bites set.
Roll into balls: Scoop about 1–1.5 tablespoons of mixture per bite and roll into balls with your hands.
Lightly damp hands prevent sticking.
Set and store: Place the bites on a parchment-lined plate or tray. Chill for another 10–15 minutes to firm up, then transfer to an airtight container.