Peel the bananas and cut them in half crosswise.
Insert a popsicle stick into the cut end of each banana half. Place them on a baking sheet lined with parchment paper or a silicone mat.
Prepare the Chocolate Coating. Option 1: Combine dark chocolate and coconut oil in a microwave-safe bowl. Microwave in 30-second intervals, stirring in between, until the chocolate is completely melted and smooth. Be careful not to overheat the chocolate. Option 2: Fill a saucepan with a couple of inches of water and gently simmer over medium-low heat. Place a heatproof bowl (preferably stainless steel or glass) on top of the saucepan, ensuring it fits snugly and the bottom doesn't touch the water. Add the chopped chocolate and coconut oil to the bowl. Stir the chocolate and coconut oil occasionally with a spatula as they melt. Continue heating until the mixture is completely melted and smooth. Remember that melting chocolate in a double boiler allows for gentle and gradual heating, reducing the risk of burning or overheating.
Working quickly, dip each banana pop into the melted chocolate mixture. If needed, you can use a spoon to help with the coating. I found using a tall glass helpful for easier dipping. Let any extra chocolate drip off before placing the coated banana pops onto the baking sheet.
Place the coated banana pops back onto the lined baking sheet and sprinkle with chopped nuts.
Put the baking sheet in the freezer and let the banana pops freeze for at least 1-2 hours or until the chocolate is completely set.
Once set, they're ready to enjoy! Serve them as a delicious sweet treat for hot summer days.