4 sqs. unsweetened chocolate
3/4 c. butter
1 2/3 c. sugar
1 tsp. vanilla
1/4 tsp. salt
4 eggs
1 c. mashed potatoes (can be leftovers)
2 c. all-purpose flour
1/2 c. chopped nuts (optional)

Melt chocolate and butter in saucepan. While mixture is cooling, cream sugar, vanilla, salt, and eggs together. Add chocolate mixture and mix well. Add potatoes, flour, and nuts. Beat until creamy. Pour into greased and floured 9 x 11 inch cake pan and bake at 350°F about 30 minutes or until done. Do not overbake, should be chewy. Cool and sprinkle with powdered sugar.