Slice bananas into 1/2-inch rounds and lay them on a parchment-lined tray.

Freeze the rounds for 30 minutes until firm.

Melt chocolate and coconut oil in a microwave in 20-second bursts, stirring between.

Dip each frozen banana half about halfway into the chocolate.

Place dipped bites back on parchment. Sprinkle nuts or sprinkles if using.

Freeze again for 15 minutes until chocolate sets.

Transfer to a freezer bag for storage.