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In a mixing bowl, cream shortening, peanut butter and sugar.
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Add egg, milk and vanilla.
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Combine the flour, baking soda and salt; gradually add to creamed mixture.
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Turn onto lightly floured surface; roll into a 16 inch by 12 inch rectangle.
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Melt chocolate chips; cool slightly.
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Spread over dough to within 1/2 inch of edges.
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Tightly roll up jelly-roll style, starting with a long side.
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Wrap in plastic wrap; refrigerate for up to 30 minutes.
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Unwrap and cut into 1/4 inch slices.
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Place 1 inch apart on ungreased baking sheets.
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Bake at 350° for 8-10 minutes or until lightly browned.
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Remove to wire racks to cool.