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Preheat oven to 360 degrees.
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Combine together in a medium bowl:.
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flour, baking soda, and salt.
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Stir together and set aside.
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Combine in a very large mixing bowl:.
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butter straight from the refrigerator, vanilla and the sugar.
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Blend with mixer until thoroughly mixed.
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By hand mix in one egg at a time.
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Mix thoroughly after each one.
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Add the 2 eggs yolks last and mix thoroughly.
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Now mix in by hand with a wooden spoon 1/3 of the flour mixture.
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Repeat until all flour mixture is thoroughly blended.
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Chop 12 oz.
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of milk chocolate into chunks and add to the mixture.
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Chop 12 oz.
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of semi-sweet chocolate into chunks and add to the mixture.
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Divide dough into thirds.
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Spoon each third onto a separate piece of wax paper and roll each up twisting the ends tightly closed.
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Refrigerate all three rolls for a minimum of 45 minutes.
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Take one roll out and cut about 3/4 inch slices and place them on your ungreased cookie sheet.
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Lightly pinch up the sides when you place the slice on the sheet.
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If you have dough left, place the roll back in the refrigerator until ready to put on the next sheet.
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Bake in a 360 degree oven for 17-19 minutes until golden brown.
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Cool.
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*Tips: Use cold butter, cool cookie sheet before putting a new batch on it, turn up the sides a little when you place the slice on the sheet, keep rolls in the refrigerator between using,.