Preheat oven to 180 degrees C (350 degrees F). Line a small rectangular pan (approximately 25 x 19 cm/ 10 x 7,5 inch) with a sheet of parchment paper so that it hangs out on two opposite sides. Grease the pan well on top of the paper.
In a bowl combine flour, baking powder and salt.
In a large mixing bowl using an electric mixer beat butter and two kinds of sugar, until fluffy. Add egg and vanilla and beat again shortly, until smooth. Gradually add the flour mixture and the cookie crumbs and mix gently with wooden spatula until absorbed.
Press the dough onto the bottom of the prepared pan.
Sprinkle on top evenly all the products for the layers: walnuts, dates, coconut, chocolate and condensed milk. Place over the pan a sheet of aluminium foil, without wrapping it.
Bake for about 30 minutes or until the cake is set and the edges start browning. Let cool completely before cutting into pieces.