Turn on your oven to 180C/350F/Gas Mark and allow to heat up.
Add the chocolate chips and butter to a glass mixing bowl (NOT metal) and place in the microwave for about 90 seconds on medium high. Remove from the microwave and allow to cool slightly before mixing.
When cooled, add the vanilla, salt (brings out the flavour in the chocolate) and both the white and brown sugars and whisk well to fully combined.
Crack the eggs into the mixture and whisk until thoroughly combined.
Next sift the cocoa powder and the flour into the mixture and yes you guessed int. Mix together. I use a soft flexible spatula for this part as you need to be gentle.
Add the remaining chocolate chips into the bowl and mix in for a little bit of gooeyness.
These quantities are perfect from a square 9-inch baking tray. Line the tray with parchment/greaseproof paper and lightly cover with non-stick spray.
Pour the brownie mixture into the tray and using the spatula make sure nothing is left behind in the bowl.
Place in the oven and bake for 35 – 40 minutes.
To test whether the brownies are cooked, pierce with a skewer or cocktail stick. If it comes out virtually clean.