Put all the ingredients in a food processor, pulse until combined, press them into a cake tin and put it into the refrigerator.
For the filling:
Preheat oven.Beat the cream cheese with yogurt and sugar for about 3 minutes.Keep on beating and add eggs, one at time.Add then walnuts, maple syrup, salt and vanilla.
Pour the mixture over the base, bake for about 40-45 minutes at 360°F, the centre should be a little wobbly.Let it cold down for a couple of hours then refrigerate for at least six.
Right before serving add on top walnuts and maple syrup.