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Preheat oven to 350 degrees F (175 degrees C).
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In a large bowl, cream together the first four ingredients until light and fluffy.
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Add eggs one at a time, beating well after each addition. Then add in vanilla.
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Combine dry ingredients in a seperate bowl, then stir into the creamed mixture.
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Fold the chocolate chips into the batter.
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Then lastly, gently fold in the cocoa powder to create a marbled effect.
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Drop by rounded spoonfuls onto an ungreased cookie sheet.
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Bake for 8 to 10 minutes. Allow cookies to cool on baking sheet for 5 minutes before removing to a wire rack to cool completely.