Reese’s Chewy Chocolate Cookies

2 cups flour
3/4 cup cocoa
1 teaspoon baking soda
1/2 teaspoon salt
1 1/4 cups butter or margarine — softened
2 cups sugar
2 eggs
2 teaspoons vanilla extract
10 ounces Reese’s peanut butter chips

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Heat oven to 350. Stir together flour, cocoa, baking soda and salt. In large bowl, beat butter and sugar with electric mixer until light and 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. 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.