Chocolate Brownies

1/2 Cup margarine
2 Squares (2 Ounces) unsweetened chocolate
1 Cup sugar
2 Eggs
1 Teaspoons vanilla
3/4 Cup all purpose flour
1/2 Cup chopped nuts (optional)
In a medium saucepan melt margarine and chocolate over low heat. Remove from heat. Stir in sugar, eggs, and vanilla. Beat lightly by hand just till combined. Stir in flour and nuts. Spread batter into greased 8X8X2 inch baking pan. Bake in a 350 degree oven for 30 minutes.