Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking dish or line it with parchment paper.
In a large bowl, whisk together the melted butter and sugar until smooth and glossy—like chocolate lava.
Stir in the cocoa powder and vanilla extract. If it smells like happiness, you're on the right track.
Add the eggs one at a time, mixing well after each. Don’t rush this—let each egg feel special.
Fold in the flour and salt until just combined. Don’t overmix; this isn’t a cardio session.
Pour the batter into your prepared pan and smooth the top with a spatula.
Bake for 30–35 minutes. You’re looking for set edges and a slightly soft center—it’ll firm up as it cools.
Let them cool (if you can wait) before slicing into squares of happiness.