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In a large bowl, beat butter, shortening, peanut butter, granulated sugar, brown sugar, and eggs on medium speed of electric mixer until well blended.
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Stir together flour, baking soda, baking powder, and salt; add to butter mixture, beating until well blended.
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Stir in chocolate chips.
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Drop by rounded teaspoons onto ungreased cookie sheets.
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Bake at 375 degrees 8-10 minutes or until set.
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Cool slightly. Remove from cookie sheet to wire rack.