Line a small 6 x 6 or 4 x 6 baking tray with parchment paper and set aside.
In a large mixing bowl, add your mashed bananas and set aside.
In a microwave safe bowl or stovetop, melt your coconut oil with your nut butter. Pour into the mixing bowl and mix well with your mashed banana. Stir through your chocolate chips- It should start to melt and marble through.
Transfer the fudge batter into the lined baking tray and press firmly in place. Place in the freezer for at least 30 minutes, to firm up before slicing into pieces.
Banana Chocolate chunky monkey fudge is best kept in the freezer, but for a softer texture, you can keep them refrigerated. Regardless of which method you store them as, only thaw them out slightly- They lose their firmness quite quickly.