Heat olive oil and chopped chocolate together till the chocolate is completely melted in a double boiler or microwave. If you are using a microwave be careful not to burn the chocolate.
Add the sugar to the melted chocolate mixture and let it stand for 5 minutes till slightly cool.
Now add egg one by one and stir till mixed
Add sea salt, scraped vanilla paste and stir.
Sieve together, cocoa powder and flour and add to the above mixture. Gently mix.
In the end fold the chocolate chips in. Grease and line a 6x6 baking pan with parchment paper and pour the batter. Spread the chopped and toasted nuts on top of the batter. And bake for 30-35 minutes.
Let it cool for atleast an hour before slicing, use a wet knife for cleaner slices.