Prepare the Batter

1. Preheat Oven: Preheat your oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper, leaving some overhang for easy removal.
2. Melt Butter: In a medium saucepan, melt the butter over low heat. Remove from heat and whisk in the granulated sugar and brown sugar until smooth.
3. Add Eggs and Vanilla: Let the mixture cool slightly, then whisk in the eggs, one at a time, followed by the vanilla extract.
4. Combine Dry Ingredients: In a separate bowl, sift together the flour, cocoa powder, and salt.
5. Mix Wet and Dry: Gradually fold the dry ingredients into the wet mixture until just combined.
6. Add Chocolate: Stir in the melted dark chocolate and chocolate chips, ensuring they’re evenly distributed.

Bake the Brownies

1. Pour Batter: Pour the brownie batter into the prepared pan, spreading it evenly with a spatula.
2. Bake: Bake for 35-40 minutes, or until a toothpick inserted into the center comes out with moist crumbs (not wet batter).
3. Cool: Allow the brownies to cool in the pan for 10-15 minutes before lifting them out using the parchment overhang. Let them cool completely on a wire rack.

Slice and Serve

1. Slice: Use a sharp knife to cut the brownies into 16 squares. For clean edges, wipe the knife clean between cuts.
2. Serve: Enjoy warm with a scoop of vanilla ice cream or a drizzle of chocolate sauce.