2 sticks (8 oz.) unsalted butter
4 oz. unsweetened chocolate, coarsely chopped
2 c. sugar
4 eggs
1 tsp. vanilla extract
1 c. all purpose flour
1/2 tsp. salt
1 generous cup coarsely chopped walnuts or pecans (about 3 oz.)

1. Preheat the oven to 350 degrees. Lightly grease a 13 x 9 x 2 inch metal or ceramic baking pan.

2. In a large saucepan, heat the butter over moderately low heat until half melted. Add the chocolate and stir until the butter and chocolate are completely melted and combined. Remove from the heat and stir in the sugar with a wooden spoon until incorporated.

3. Using the wooden spoon, beat in the eggs, one at a time, stirring after each addition until the eggs are fully incorporated and the chocolate mixture is shiny. Stir in the vanilla. Add the flour and salt all at once and mix until blended. Stir in the chopped nuts.

4. Scrape the batter into the prepared pan. Bake for 30 minutes, or until the brownies are slightly firm to the touch and a cake tester inserted in the center indicates the brownies are moist. Let cool completely in the pan. Cut into 35 bars.