In a bowl, mash the ripe banana until smooth.
Add the creamy peanut butter to the mashed banana and mix until well combined.
Stir in the peanuts and plain Greek yogurt until everything is evenly mixed.
Shape the mixture into cookie forms.
Dip each cookie into the melted dark chocolate, making sure they are completely coated.
If desired, sprinkle flaky sea salt on top of the cookies.
Place the cookies in the freezer for 30 minutes to allow them to set.
