This recipe comes from Better Homes and Gardens Cookies and Candies cookbook (1966), a wonderful cookbook that somehow made its way from my mother's kitchen to mine. These used to be a movie night staple for us and are responsible for a number of extra pounds.
1/4 cup butter
3/4 cup sugar
1 teaspoon vanilla
1/4 cup light corn syrup
2 eggs
2 ounces unsweetened chocolate, melted and cooled
1 cup flour
1/2 teaspoon salt
1/2 teaspoon baking powder
1/2 cup chocolate chips
1/2 cup chopped walnuts (optional)
Cream butter, sugar and vanilla til fluffy. Add syrup and continue creaming. Beat in eggs and chocolate. Sift together dry ingredients and stir into batter. Fold in chocolate pieces and walnuts. Spread in greased 9x9x2" baking pan. Bake at 350 for about 25 minutes. Cut in bars when cool.