Peel the bananas and slice them into 1-inch thick rounds. Set aside.
In a microwave-safe bowl, combine the dark chocolate chips and coconut oil. Microwave in 30-second intervals, stirring in between, until the chocolate is completely melted and smooth.
Line a baking sheet with parchment paper.
Dip each banana slice into the melted chocolate, ensuring it is fully coated. Use a fork to lift the coated slice, allowing excess chocolate to drip off.
Place the chocolate-covered banana slice onto the prepared baking sheet.
Immediately sprinkle with chopped nuts, shredded coconut, and a pinch of sea salt if desired.
Repeat the process until all banana slices are coated.
Once done, place the baking sheet in the freezer for about 30 minutes, or until the chocolate is firm and set.
Serve chilled or at room temperature, and enjoy your delicious treats!