In a large glass mixing bowl, place the butter or coconut oil, dates, and milk.
Microwave for 2 minute intervals, mashing with a fork in between, until the dates turn into a paste.
Mash in the bananas.
Stir in the brown sugar, cocoa powder, Naked Whey whey protein isolate, eggs, and oat flour.
Lightly grease a mini muffin tin.
Fill the tin with batter by scooping with a large spoon and scraping it out with another.
Bake for 12 minutes.
Allow to cool for at least 5 minutes before removing from tin.
Whip together the frosting (if using) and spread on top once completely cool. If you're planning on piping the frosting on with a decorating bag, plan to double the frosting amount.
Store in the fridge. Will keep for up to one week.
Notes
*If you don't have pre-milled oat flour you can pulse rolled oats in your blender until you achieve a flour-like consistency.*A thick yogurt is necessary to get the right consistency for this frosting