Oven to 350 degrees. Lightly grase cookie sheet. Beat butter adn peanut butter in large bowl at med speed until creamy. Gradually add sugars, beating until well mixed. Add egg and vanilla, beat until light and fluffy. Stir together flour, soda and salt, add to butter mixture beating until well blended. Stir in chocolates. Drop by rounded tablespoons onto cookie sheet. Bake 10-12 minutes or until lightly browned. Cool slightly; remove to wire rack to cool completely.
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