01 - Peel the bananas and slice into 1/2-inch thick rounds.
02 - Line a baking sheet with parchment paper and place the banana slices in a single layer.
03 - Freeze the slices for at least 1 hour until firm.
04 - Combine chocolate and coconut oil (if using) in a heatproof bowl over simmering water or microwave in short bursts, stirring until smooth.
05 - Dip each frozen banana slice into melted chocolate, letting excess drip off.
06 - Place chocolate-coated slices back on parchment and immediately sprinkle with chopped peanuts before the chocolate sets.
07 - Return the tray to the freezer for 15 to 20 minutes until the chocolate hardens.
08 - Serve chilled as a frozen bite-sized treat.