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Preheat oven to 350°F.
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To remove skins from hazelnuts, spread in single layer on baking sheet.
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Bake 10 to 12 minutes or until toasted and skins begin to flake off; let cool slightly.
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Wrap hazelnuts in heavy kitchen towel; rub against towel to remove as much of the skins as possible.
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Place hazelnuts in food processor.
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Process using on/off pulsing action until hazelnuts are ground but not pasty.
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Combine flour and salt in small bowl.
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Beat powdered sugar and butter in medium bowl with electric mixer at medium speed until light and fluffy.
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Beat in egg and vanilla Gradually add flour mixture Beat in ground hazelnuts at low speed until well blended.
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Place dough on sheet of waxed paper.
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Using waxed paper to hold dough, roll back and forth to form log 12 inches long and 2 1/2 inches wide.
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Wrap log in plastic wrap; refrigerate until firm, at least 2 hours or up to 48 hours.
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Preheat oven to 350°F Cut dough into 1/4-inch-thick slices; place on ungreased cookie sheets.
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6.
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Bake 10 to 12 minutes or until edges are very lightly browned.
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Let cookies stand on cookie sheets 1 minute.
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Remove cookies to wire racks-cool completely.
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Place chocolate chips in 2-cup glass measure.
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Microwave at HIGH 1 to 1 1/2 minutes or until melted, stirring after 1 minute and at 30-second intervals after first minute.
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Dip cookies into chocolate coating about 1/2 of each cookie.
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Let excess drip back into cup.
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Transfer cookies to waxed paper; let stand at room temperature 1 hour or until set.