In a large bowl, cream butter and sugars until light and fluffy. Beat in egg, sour cream and vanilla. Combine dry ingredients; gradually add to the creamed mixture. Stir in chips.
Drop by rounded tablespoonfuls 2 in. apart onto greased baking sheets. Bake at 350° for 12-15 minutes or until set. Cool for 2 minutes before removing to wire racks to cool completely. Yield: about 3 dozen.
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