Saucepan Fudge Brownies

1/2 cup butter
2 ounces unsweetened chocolate
1 cup sugar
2 eggs
1 tsp vanilla
3/4 cup flour
1/2 cup chopped walnuts (optional)

Preheat oven to 350 degrees. Line an 8x8x2 inch glass baking pan with parchment paper. In a medium-sized saucepan, melt butter and chocolate over low heat. With a wire whisk, stir in sugar, vanilla, eggs (one at a time), flour and nuts. Bake at 350 for 30 minutes. Cool and cut into squares.