Best Chocolate Brownies

Ingredients:

1 c Butter or margarine
4 oz Unsweetened chocolate
2 c Sugar
4 Eggs
1 c All purpose flour
2 ts Vanilla
1 ts Baking powder
1 c Chopped walnuts
1 c Semi-sweet chocolate

Directions:
In a 2 quart saucepan melt butter or margarine and unsweetened chocolate over low heat. Transfer chocolate mixture to a large mixer bowl. Add sugar, mix well, add eggs, one at a time, beating just till blended. In a mixing bowl stir together flour and baking powder. Add to chocolate mixture along with the vanilla, mix well. Pour batter into a greased and floured 13x9x2 inch baking pan. Sprinkle with the chopped walnuts and chocolate pieces. Bake in oven at 325 degrees F about 45 minutes or till done. Let cool on a wire rack. Cut into bars.