Begin with Chocolate: In a medium bowl, invoke the silkiness of melted butter and the dark essence of cocoa. Mix until smooth, a journey begun.
The Dry Symphony: Flour, salt, sugar. Combine them, a crumbly dance.
The Elixir: Eggs and vanilla extract. Pour, mix, observe transformation to smooth richness.
The Canvas: A 9x13 pan, lined with parchment paper. Pour the batter, the artwork's foundation.
The Alchemy of Baking: 350°F, 20 to 25 minutes. The toothpick’s secret wisdom: clean, it whispers perfection.
Frosting, the Brownies' Crown: While they bake, whisk butter, milk, powdered sugar, cocoa, vanilla. Thick, spreadable, reminiscent of canned frosting, but transcendent. If thick, whisper milk, a tablespoon at a time.
A Pause: 15 to 20 minutes. Wait, then frost. A luscious spread atop the brownies.
The Finale: Let cool, a patient surrender. Then slice. Serve. Savor.