1Preheat the oven to 325°F and line an 8x8-inch pan with parchment.
2Melt the butter in a small saucepan or right in the mixing bowl in the microwave. Stir in the sugar, cocoa, vanilla and salt; stir until well blended, and there are no more lumps of cocoa. Stir in the eggs, then the flour.
3Spread the batter in the pan, smoothing the top, and bake for 25 minutes, until just set - a toothpick poked in will come out with moist crumbs stuck to it. Cool completely in the pan, then remove the whole thing by lifting out with the edges of the parchment and cut into squares. Makes 16 brownies.