Cream together, butter, sugar and eggs. Mix in remaining ingredients. Blend well.
Drop by teaspoonful onto a cookie sheet. Bake at 350 degrees F (175 degrees C) for 8-9 minutes. Cookies will be soft. Cool about 1 minute on cookie sheet then remove to a wire rack to cool completely.
Recipe Variation: For a different flavor, omit peppermint extract and use a total of 2 teaspoons of vanilla. Also substitute peanut butter flavored chips for the chocolate chips.
