Heat the butter in the microwave for 20 seconds so the butter becomes soft.
In a bowl mix the butter, flour and the sugar in to a pie dough.
Roll out the dough and cover the bottom and the edges of a pie form. Pick the pie bottom evenly with a fork and place it in the fridge for 30 minutes.
Preheat the oven at 165 degrees Celsius.
Chop the chocolate and walnuts in preferred sizes.
Beat the eggs in a bowl until white and foamy.
While still whipping add the sugar, brown sugar, flour and mix well.
Add the chocolate and walnuts and stir gently with a wooden spoon. Spread evenly the batter in the pie form.
Place in the middle of the oven for 50-60 minutes.
Take out the pie and let it cool down and then keep cold until it is time to serve it.