Step 1: Preheat the Oven - Begin by preheating your oven to 350°F (175°C). This ensures your brownies bake evenly and achieve that perfect fudgy texture.
Step 2: Melt the Chocolate and Butter - In a microwave-safe bowl, combine the chopped semi-sweet chocolate and melted butter. Microwave in short intervals, stirring in between, until everything is melted and smooth.
Step 3: Mix in Sugar and Salt - Once your chocolate and butter mixture is cool enough to touch, add in the granulated sugar and salt. Stir until fully incorporated.
Step 4: Add Vanilla and Eggs - Mix in the vanilla extract followed by the beaten eggs. Whisk until the mixture is well combined and glossy.
Step 5: Sift in Cocoa Powder and Cornstarch - Sift the dark cocoa powder and cornstarch into the bowl. This step prevents lumps and ensures a smooth batter. Fold gently until just combined.
Step 6: Fold in Chocolate Chips - Add the chocolate chips or chunks into the batter, folding them in with a spatula for an extra chocolatey bite.
Step 7: Pour into Baking Pan - Grease your baking pan lightly and pour the brownie batter into it, spreading it evenly with your spatula.
Step 8: Bake - Bake in the preheated oven for 20-25 minutes. The brownies are done when the edges look firm, and a toothpick inserted in the center comes out with a few moist crumbs.
Step 9: Cool and Slice - Allow the brownies to cool in the pan for at least 10 minutes before transferring them to a wire rack. Once fully cooled, slice them into squares and enjoy!