Jumbo Brownies

Directions

1. 1
   Preheat the oven to 350.
2. 2
   Spray a 9-by-13-inch glass or ceramic baking dish with cooking spray.
3. 3
   In a double boiler, melt the butter with the chopped chocolate over low heat.
4. 4
   In a small bowl, whisk the flour with the baking powder and salt.
5. 5
   In a large bowl, using a handheld mixer, beat the eggs with the sugar at medium-high speed until pale and thick, 4 minutes.
6. 6
   Beat in the vanilla and espresso.
7. 7
   Add the flour mixture and beat until just incorporated.
8. 8
   Beat in the melted chocolate at medium speed.
9. 9
   Using a spoon, stir in the chocolate chips and walnuts.
10. 10
    Scrape the batter into the prepared baking dish.
11. 11
    Bake in the center of the oven for about 1 hour, until the top is shiny and lightly cracked, the edges are set and the center is still a bit jiggly.
12. 12
    Transfer the dish to a rack and let cool completely.
13. 13
    Cut the brownie into 12 large rectangles and serve.