Preheat your oven to 350°F (175°C) and grease a 8×8-inch pan or line it with parchment. Yes, preheating matters; no one wants a doughy surprise mid-bake.
In a medium bowl, whisk together melted butter and sugar until smooth. It’ll look a bit glossy—that’s your cocoa-coated destiny calling.
Beat in the eggs one at a time, then mix in vanilla. Don’t rush this part; you’re building structure for greatness.
Sift in the flour, cocoa powder, and salt. Stir until just combined; overmixing = tougher brownies, and nobody wants that drama.
Fold in chocolate chips if you’re using them. Then spread the batter evenly in the pan.
Bake for about 20–25 minutes. A toothpick should come out with a few moist crumbs. If it’s clean, you’re in danger of dry brownies—pull them when they’re just shy of done.
Cool completely in the pan before slicing. Patience is a virtue, especially when the center turns fudgy and fabulous.