Soak 2 cups of dates in hot water for and hour. Peel, remove the pits.
Save 1 tbsp of the soaking water and add to the food processor. Process finely and set aside.
In a clean bowl and using a hand whisk mix the eggs and dates, flavor with the cinnamon and vanilla extract, add the very soft butter, mix well then add the flour and baking powder.
Bake inside a well greased 8 or 9 inch pan. Bake 30 minutes at 350 degrees F or until a toothpick inserted comes out clean.
