Good Eats - Art of Darkness II: Cocoa

• Soft butter, for greasing the pan
• Flour, for dusting the buttered pan
• 4 large eggs
• 1 cup sugar, sifted
• 1 cup brown sugar, sifted
• 8 ounces melted butter (2 sticks)
• 1 1/4 cups cocoa, sifted
• 2 teaspoons vanilla extract
• 1/2 cup flour, sifted
• 1/2 teaspoon kosher salt

1. Preheat the oven to 300 degrees F. Butter and flour an 8-inch square pan.
2. In a mixer fitted with a whisk attachment, beat the eggs at medium speed until fluffy and light yellow. Add both sugars. Add remaining ingredients, and mix to combine.
3. Pour the batter into a greased and floured 8-inch square pan and bake for 45 minutes. Check for doneness with the tried-and-true toothpick method: a toothpick inserted into the center of the pan should come out clean.
4. When it's done, remove to a rack to cool. Resist the temptation to cut into it until it's mostly cool.