Heat oven to 350 degrees Fahrenheit. 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.
Pan Recipe: Spread batter in greased 15-1/2x10-1/2x1-inch jelly-roll pan. Bake at 350 degrees Fahrenheit 20 minutes or until set. Cool completely in pan on wire rack; cut into bars. About 4 dozen bars.
Ice Cream Sandwich: Prepare CHEWY CHOCOLATE COOKIES as directed; cool. Press small scoop of vanilla ice cream between flat sides of cookie. Wrap and freeze.
High Altitude Directions Increase flour to 2 cups plus 2 tablespoons. Decrease baking soda to 3/4 teaspoon. Decrease sugar to 1-2/3 cups. Add 2 teaspoons water with flour mixture. Bake at 350 degrees Fahrenheit, 7 to 8 minutes. Yield increases to about 6 dozen.
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