Reese's Chewy Chocolate Cookies (Peanut Butter Chips)

Ingredients
 2 cups all-purpose flour
 3/4 cup HERSHEY'S Cocoa
 1 teaspoon baking soda
 1/2 teaspoon salt
 1-1/4 cups (2-1/2 sticks) butter or margarine , softened
 2 cups sugar
 2 eggs
 2 teaspoons vanilla extract
 1-2/3 cups (10-oz. pkg.) REESE'S Peanut Butter Chips

 Directions
 1 Heat oven to 350°F. Stir together flour, cocoa, baking soda and salt; set aside.
 2 Beat butter and sugar in large bowl with mixer until fluffy. Add eggs and vanilla; beat well. Gradually add flour mixture, beating well. Stir in peanut butter chips. Drop by rounded teaspoons onto ungreased cookie sheet.
 3 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. About 4-1/2 dozen cookies.