Preheat oven to 175'C
Melt 1/3 cup dark chocolate along with coconut oil in microwave for a minute or so.
Combine all ingredients together except choco chips and walnuts in a good food processor and blend until completely smooth.
Mix in choco chips and walnuts.
Pour the batter in 8*8 inch greased pan and smooth the top by spreading evenly.
Bake in preheated oven for 25-30 minutes.
Cool completely before trying to slice . (To get clean cuts use a warm knife)