1 c. butter
1 1/2 c. sugar
2 eggs
2 tsp. vanilla
2 c. flour
2/3 c. cocoa
3/4 tsp. baking soda
1/2 tsp. salt
2 c. (12 oz.) Reese's peanut butter chips

Cream together butter, eggs, sugar, and vanilla. Combine flour, cocoa, soda, and salt. Add to creamed mixture. Stir in chips. Chill dough until firm enough to handle. Shape into 1 inch balls. Place 2 inches apart on ungreased cookie sheets. Bake at 350 degrees for 8 to 10 minutes.