Put dates in a bowl with warm water, allow dates to soak for 30 minutes, then drain.
Mix together dates, almonds, walnuts, and 1/4 cup cocoa powder in a food processor until well blended. Spread mixture in a 9—5 baking pan (or an 8—8 is okay) until evenly distributed, and press down gently with a spoon.
Mix together bananas, almond butter, honey, and other 1/4 cup cocoa powder in the food processor until well blended. Spread mixture over bottom layer until evenly distributed. Place in freezer for 30 minutes.
Cut into 16 squares. Re-freeze whatever you don't eat, and enjoy at another time!