Line a 8x8 baking tin with foil and give it a good grease with coconut oil.
Make the flaxseed egg. Mix flaxseed meal with 6 tbsps of water and leave for 5 mins.
In a large bowl bung in tahini, coconut yog, maple syrup, coconut sugar, flaxseed egg and vanilla extract.
In another bowl add the coconut flour, baking powder, salt and cocoa/cacoa. Whisk to get rid of any lumps.
Add the dry ingredients into the wet bowl along with the choc chips. Give it a good stir with a spoon till combined.
Pour into the baking tin, whack in the oven on the middle shelf and cook for 40-45 mins. Cool in the tin before lifting out.
While that's baking crack on with the frosting. Bung all ingredients in a blender and blitz till smooth and creamy. Scrap into a bowl and chill for at least 3 hours to firm up (this stage can be done in advance)
When ready to frost, take the frosting out the fridge and beat with a hand held whisk for around 3 mins till fluffy. Fold in the choc chips. Spread the frosting ontop of the brownie and chill for a couple of hours to firm up before slicing.