Step 1: Melt the Chocolate and Butter

1. In a heat-safe bowl, add the chocolate bar and butter.
2. Melt them together using a double boiler or microwave. If using a microwave, heat in short intervals and stir in between so the chocolate does not burn.
3. Once melted, mix until smooth and glossy. Keep it aside and let it cool slightly before adding it to the batter.
4. Do not add hot chocolate mixture directly to the eggs, because it can cook the eggs.

Step 2: Beat the Eggs and Sugar

1. In a separate mixing bowl, add the eggs, brown sugar, white sugar, and vanilla essence.
2. Beat everything together until the mixture becomes slightly light and smooth.
3. This step helps give the brownies a better texture and a shiny top.

Step 3: Add Flour and Cocoa Powder

1. In another bowl, mix the all-purpose flour and cocoa powder.
2. Add this dry mixture into the egg and sugar mixture.
3. Use a spatula to gently fold everything together. Do not overmix, because overmixing can make brownies dry or heavy.

Step 4: Add the Melted Chocolate Mixture

1. Once the chocolate and butter mixture has cooled slightly, pour it into the brownie batter.
2. Fold gently with a spatula until everything is combined.
3. The batter should look thick, smooth, and chocolatey.

Step 5: Prepare the Baking Pan

1. Line a baking pan with parchment paper.
2. Pour the brownie batter into the pan and spread it evenly.
3. Tap the pan gently on the counter to remove air bubbles.

Step 6: Bake the Brownies

1. Bake the brownies in a preheated oven at 180°C for 20 to 25 minutes.
2. For fudgy brownies, do not overbake them. Insert a toothpick in the center. If it comes out with a few sticky crumbs, the brownies are ready.
3. If the toothpick comes out completely clean, the brownies may become more cake-like and dry.

How to Know Brownies Are Done

1. Brownies are done when the top looks shiny and slightly crackly, the edges are set, and the center still feels a little soft.
2. When you insert a toothpick, it should not come out with wet batter, but it should have sticky crumbs.
3. That sticky crumb texture is what keeps the brownies fudgy.