01 -
Position an oven rack in the middle of the oven and preheat to 325°F (162°C). Line an 8-inch square baking pan with parchment paper or aluminum foil, allowing it to hang over the sides for easy removal.
02 -
In a medium saucepan, melt the butter over medium-low heat until fully liquefied. Remove from heat and avoid browning.
03 -
While the butter is still hot, stir in the sugar, cocoa powder, vanilla, and salt until the mixture is smooth. It's okay if the texture seems gritty initially.
04 -
Let the mixture cool until it's warm to the touch, about 5 to 10 minutes. The batter should feel comfortable when touched.
05 -
Add the cold eggs one at a time, stirring vigorously after each addition until the batter is thick and well blended.
06 -
Gradually add the flour, beating the batter with a wooden spoon or spatula for about 40 to 50 strokes until it pulls away from the sides.
07 -
Fold in nuts or chocolate chips if using.
08 -
Spread the thick batter evenly into the prepared pan. It may be challenging to spread due to its density, so use a spatula to smooth it out.
09 -
Bake for 20 to 30 minutes, until the edges appear dry and the center is slightly underbaked. A toothpick inserted should come out a bit moist.
10 -
Allow the brownies to cool completely in the pan before lifting them out. This ensures they set properly.
11 -
For clean slices, chill the brownies in the fridge for 1 to 2 hours and cut into 16 squares using a clean, sharp knife.