1/2 cup (1 stick) unsalted butter + *1 tsp
2 1-oz squares unsweetened chocolate
1 cup granulated sugar
1/2 cup all-purpose flour, sifted
1/2 cup chopped pecans or walnuts
1/2 tsp baking powder
1 tsp pure vanilla extract
2 large eggs, slightly beaten
1 cup semisweet chocolate chips
Preheat oven to 350°F. Butter an 8-inch-square glass pan (use the *1 tsp butter for this), or spray it with baking spray.
Melt the stick of butter and unsweetened chocolate in the top of a double boiler (or in a microwave); remove from heat and stir well. In a mixing bowl, combine the butter-chocolate with the sugar, flour nuts, baking powder and vanilla. Stir well with a wooden spoon. Add the eggs and mix thoroughly. Stir in the chocolate chips.
Pour the batter into the prepared pan and bake for 30-40 minutes, or until a toothpick inserted in the center comes out clean. Do not overcook. The brownies should be moist and chewy. Cool thoroughly before cutting into 2-inch squares.