1 c. (2 sticks) butter, softened
1 1/2 c. sugar
2 eggs
2 tsp. vanilla extract
2 c. all-purpose flour
2/3 c. Hershey's cocoa
3/4 tsp. baking soda
1/4 tsp. salt
2 c. (12 oz.) pkg.) semi-sweet chocolate chips
1/2 c. coarsely chopped nuts (optional)

Heat oven to 350 degrees. In large mixer bowl, beat butter, sugar, eggs and vanilla until light and fluffy. Stir together flour, cocoa, baking soda and salt; add to butter mixture. Stir in chocolate chips and nuts, if desired. Drop by rounded teaspoonfuls onto ungreased cookie sheet. Bake 8 to 10 minutes or just until set. Cool slightly; remove from cookie sheet to wire rack. Cool completely. About 4 1/2 dozen cookies.