Pre-heat oven to 175°C (conventional)
Add the flour, cocoa powder, baking powder, baking soda and sea salt (optional) into a bowl then mix and set aside
Place the butter in a heat-proof bowl and microwave for 20-second bursts, stirring in-between heating, until fully melted
Add the vanilla extract, white and brown sugar to the butter and whisk until a thick mixture forms
Add the eggs to the bowl containing the sugar and butter mixture and beat until combined
Slowly add the flour mixture to the bowl containing the sugar and butter by using a sieve and folding the dry ingredients in until well-combined into a thick batter
Gently melt the chocolate either using a Bain-Marie method or in the microwave using short bursts and stirring each time
Add the melted chocolate to the brownie mix and gently fold in with a spatula
Line a baking tray with grease proof paper and pour in the brownie batter
Even out the mixture in the tray using a spatula
Bake for 22-25 minutes (the less time the bake, the more fudgy the brownies will be - make sure not to go too low though or they will still be raw)
Remove the brownies from the oven and leave to cool completely, in the tray, before cutting into 9 equal squares
Enjoy!
