Grease and line a 22 cm (8.66 inches) brownie tin with parchment paper and vegetable oil. See note 1.
Preheat oven to 160°C (356°F) (non-fan forced oven).
In a large bowl, combine the self raising flour, matcha powder, caster sugar, sea salt, 50 grams (1.76 ounces) white chocolate.
In a separate bowl, place the vegetable oil, vanilla extract, milk of choice, and condensed milk. Mix well.
Using the double boiler method or the microwave, melt 125 grams (4.41 ounces) while chocolate. Allow the chocolate to cool slightly but not so much that it becomes solid.
Add the melted chocolate to the wet ingredients and mix through until combined.
Add the wet ingredients to the dry ingredients and mix until the mixed is just combined and there are no lumps. Do not over mix.
Place mixture in prepared brownie tin and flatten the top. See note 2.
Bake in preheated oven for 35 to 40 minutes or until the brownie is cooked in the centre. See note 3.
Allow the brownie to cool in the tin for 10 to 15 minutes before removing from the tin and transferring it to a wire rack. Allow to cool completely and then serve.