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Sift flour, baking soda, cinnamon and salt together and set aside.
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Cream together shortening and sugars, add eggs.
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Mix flour and shortening mixture together.
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Divide dough in half, place each half on a sheet of wax paper.
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Shape dough into logs along length of wax paper. Freeze for 30 minutes.
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Melt chocolate chips in double boiler (Grandma uses semi-sweet or mint flavored for a surprise, leaving out the peanut butter in that case).
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Take one dough log out at a time and roll between 2 sheets of wax paper until it reaches across the paper, a little more than a 1/4" thick.
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Spread half of chocolate on dough. Roll up, like a jelly roll. Return to freezer. Repeat with other log.
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Allow dough to freeze for at least 30 minutes.
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When ready to bake, preheat oven to 350 degrees. Slice cookies to desired thickness.
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Bake on greased cookie sheet for 8-10 minutes.