Peel the bananas and slice them into rounds about ½ inch thick.
Line a baking sheet with parchment paper.
Arrange the banana slices in a single layer without touching.
Freeze the slices for at least 30 minutes, until firm.
Melt the chocolate chips with coconut oil in 20-second microwave intervals, stirring between each interval.
Dip each frozen banana slice halfway or completely into the melted chocolate.
Place the dipped slices back on the parchment-lined baking sheet.
Immediately add chopped nuts, coconut, sprinkles, crushed cookies, or sea salt.
Freeze for another 30 minutes, or until the chocolate is firm.
Transfer the banana bites to an airtight freezer-safe container.
Let them sit for a few minutes before serving if they are too firm.