1/2 c. (1 stick) unsalted butter
2 oz. unsweetened chocolate, chopped
1 c. sugar
2 eggs
1 tsp. vanilla extract
1/2 c. flour
1/2 c. chopped walnuts or pecans
1/4 tsp. salt

Preheat oven to 350 degrees. Grease a 9 inch square baking pan.

In a saucepan melt butter and chocolate over a low heat, stirring until smooth. Remove from heat and allow to cool slightly. Add sugar, eggs and vanilla to chocolate mixture; whisk until smooth. Gradually stir in flour and salt until well blended.