Purée the dates with 1/4 cup of water. Add bananas and maple extract (or vanilla essence) and purée. Roughly chop walnuts and sunflower seeds. Mix all ingredients together in a bowl. Oil a baking tray and line with baking paper. Press mixture firmly into the tray and bake at 160deg Celsius for approx 40min or until golden.
Hope you enjoy!
P.S. they freeze with no problems