Best Chocolate Fudge Cocoa Brownies
140g (1 1/4 sticks) unsalted butter
1 cup sugar
3/4 cup unsweetened cocoa powder (use some good stuff)
1/4 teaspoon salt (skip if using salted butter)
1 teaspoon vanilla
2 cold large eggs
1/2 cup all-purpose flour
Preheat the oven to 160°C (325°F). Line the bottom and sides of an 8-inch square baking pan.
Combine the butter, sugar, cocoa, and salt in a saucepan over very low heat. Stir until the butter is melted and the mixture is smooth and hot so that the sugar has started to dissolve a bit but the butter is not burning. Remove from the heat and set aside until the mixture is just slightly warm.
Stir in the vanilla, then add the eggs one at a time, stirring hard after each one. Add the flour and mix thoroughly for about 1 minute with a wooden spoon or a rubber spatula. Spread evenly in the lined pan (the batter will be very thick).
Bake until a toothpick emerges with some moist crumbs sticking to it (but not wet with batter), 20 to 25 minutes. Cool completely on a rack.