Preheat the oven to 185° C. Grease 8 x 8inch square pan and line with parchment paper. You can leave an overhang on the sides that will help us lift the brownies out. Set aside.
Mix 1 tbsp of lemon juice into 1 cup of milk, stir and let it stand for 5-10 minutes. This is our homemade buttermilk.
In a microwave safe bowl, combine butter, semi chocolate, and milk chocolate chips. Microwave for 1 minute in 30 sec interval.
Add granulated sugar, brown sugar, flour, cocoa powder.
Add the homemade buttermilk to the bowl and gently using a spatula mix until completely combined.
Pour the batter evenly into prepared baking pan. Bake for 30 minutes.
To check done ness insert toothpick in the center. If the toothpick comes out with wet batter, brownies are not done. But it comes out with some crumbs, brownies are done. Do not over bake.
Mine was not done by 30 mins, so I baked it for another 15 mins. However, check for done ness from 30 minutes. The way the batter wobbles, you would know if you can increase by 15 minutes or 10 minutes.
Remove from the oven and place on a cooling rack. Let it cool completely in the pan, remove and then cut into squares.
Please allow the brownies sometime to cool down, else your pieces will not come out as squares.