3/4 c. butter
4 sq. unsweetened chocolate
2 c. sugar
4 eggs, lightly beaten
1 1/4 c. unsifted all-purpose flour
1 tbsp. cinnamon
1 tsp. baking powder
1 tsp. salt
1 tsp. grated orange peel
1 c. walnuts, coarsely chopped

Preheat oven to 350 degrees. Melt butter and chocolate over very low heat; remove from heat. Stir in sugar and eggs; set aside. Combine flour, cinnamon, baking powder, salt and orange peel. Stir in chocolate mixture just until smooth and well blended. Stir in nuts.

Spread in a greased 9x13 pan. Bake until mixture starts to come away from sides of pan, about 30 minutes. Cool slightly on rack; cut into bars. Remove from pan and cool completely.