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1
In a large bowl, combine the butter, flour, sugar, baking powder, and salt.
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2
Use a pastry cutter or 2 dinner knives to cut in the butter until the mixture is fine and crumbly.
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3
In a small bowl, beat 2 of the eggs and the vanilla together and stir into the dry ingredients.
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4
Mix the dough just until all the ingredients come together.
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5
Turn the mixture out onto a floured work surface and knead for a minute or two by hand to form a cohesive dough.
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6
It should be somewhat sticky.
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7
Wrap the dough in plastic wrap and refrigerate for 1 hour.
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8
Preheat the oven to 350F.
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9
Line 2 baking sheets with parchment paper.
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10
Spread the walnuts out on a piece of waxed paper.
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11
Dust your hands with flour and shape the dough into 3 ropes, each about 1 1/2 inches in diameter.
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12
Cut each into 2-inch pieces.
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13
In a small bowl, beat the remaining egg.
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14
Dip each of the pieces into the beaten egg, then roll in the walnuts to coat evenly.
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15
Place the cookies about 1 1/2 inches apart on the prepared baking sheet.
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16
Bake the cookies until they are lightly colored, 12 to 15 minutes.
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17
Slip the parchment, with the cookies, off each baking sheet and let cool on wire racks.
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18
Let stand for 2 minutes before peeling the cookies off.
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19
Variation: Dust the cookies with confectioners sugar before serving.