Best Brownies. Ever.

Steve says these brownies are like high school cafeteria material: a nice flaky top but still half-baked and gooey in the middle. Excellent. This recipe is from Everyday Food Magazine (thanks, Martha), which includes nom-ular variations such as cream cheese, mocha, chocolate chip, and nut. I opted for mocha.
Ingredients:
8 tbsp unsalted butter (1 stick), cut into pieces, plus more for pan
1 cup flour
1/4 cup unsweetened cocoa powder
1/2 tsp baking powder
1/2 tsp salt
8 oz. semisweet chocolate, chopped
1 1/4 cups sugar
3 eggs
2 tsp instant espresso powder

Preheat oven to 350.
Brush 9x9 inch pan with butter and line with parchment paper (leave edges hanging over so you can pull it out of the pan easily when you are finished. Mix flour, cocoa, baking powder and salt. Set aside.
Place butter, chocolate, and espresso powder in a large heat-proof bowl and set over a pan of boiling water. Stir occasionally until smooth (2-3 minutes), remove bowl from pan. Add sugar, mix to combine. Add eggs, mix to combine. Add flour mixture, mix just until moistened. Transfer to prepared pan, smooth top.
Bake until toothpick inserted in middle comes out clean, about 50-60 minutes. Cool in pan for 30 minutes (if you can stand it). Lift brownies from pan using overhanging parchment paper.

Supposedly you can keep these in an airtight container for 2 days, but let's be honest, these things are not lasting that long.