1.Preheat oven at 170°C and grease the square tin with some oil or butter and line with parchment paper.
In a bowl sift together all purpose flour, cocoa powder, baking soda and mix it well.
In another bowl take butter, powdered sugar, vanilla extract and beat for a minute or till its light and fluffy.
Next add eggs, one at a time and beat for few seconds after every addition.
Now add the dry ingredients to the wet ingredients in batches and mix till well combined and form a smooth lump free batter.
At last add chunks of dark chocolate and mix well.
Pour the brownie batter in greased tin and bake at 170°C for 30-35 minutes.
Once done check with a help of a toothpick, if it comes out clean the brownie is perfectly baked.
For Tiramisu: Beat the cream till stiff peaks are formed.
Add sugar and vanilla until combined. Add in the whipped cream and beat again until smooth.
Next add coffee concoction and mix well with the whipped cream.
Keep it in refrigerator for 1 hour.
For the layering in a glass make the bottom layer with brownie pieces dipped in sugar syrup or coffee concoction.
Next add 3-4 tbsp of whipped cream mixture.
You can make as many layers as per the shape of the glass.
At last sprinkle some cocoa powder from top & garnish with a mint leaf and Serve Chilled.