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

Heat oven to 350 degrees. In large mixer bow, beat butter and sugar until light and fluffy. Add eggs and vanilla; beat well. Combine flour, cocoa, baking soda, and salt; gradually blend into butter mixture. Stir in peanut butter chips and nuts, if desired. Drop by teaspoonfuls onto ungreased cookie sheet. Bake 8 to 9 minutes. (Do not overbake, cookies will be soft. They will puff while baking and flatten while cooling.) Cool slightly; remove from cookie sheet to wire rack. Cool completely.