4 squares unsweetened baking chocolate
3/4 c. margarine
6 eggs
3 c. sugar
2 c. flour
1/2 tsp. salt
1/2 c. chopped nuts (optional)
2 tsp. vanilla

Melt margarine and chocolate. Beat eggs until fluffy. Add sugar and melted chocolate and margarine. Add dry ingredients and vanilla. Bake in a greased large jelly roll pan at 350°F for 25 to 30 minutes. Do not overbake.