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1
Heat oven to 350F.
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2
Combine flour, walnuts, baking powder, baking soda and salt in bowl; set aside.
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3
Combine sugar and butter in another bowl.
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4
Beat at medium speed, scraping bowl often, until well mixed.
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5
Add eggs and vanilla; continue beating until well mixed.
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6
Add flour mixture; beat at low speed until well mixed.
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7
Remove half of dough from bowl.
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8
Add melted chocolate to remaining dough in bowl.
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9
Beat at low speed until well mixed.
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10
Divide chocolate dough and white dough each into two equal portions.
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11
Roll each portion on lightly floured surface into 6-inch log.
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12
Place 1 chocolate roll on top of 1 vanilla roll; shape into 10x1 1/2-inch log.
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13
Repeat with remaining dough logs.
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14
Place each log 3 inches apart onto ungreased cookie sheet.
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15
Bake 23-28 minutes or until set and lightly browned.
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16
Let cool on cookie sheet 15 minutes.
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17
Reduce oven temperature to 300F.
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18
Cut logs diagonally into 1/2-inch slices with sharp serrated knife.
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19
Arrange slices on cookie sheet, cut-side down.
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20
Bake 14-18 minutes, turning once, or until golden brown and crisp.
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21
Place onto cooling rack.
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22
Cool completely.
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23
Melt chocolate chips and 1 teaspoon shortening in 1-quart saucepan over low heat, stirring occasionally, until smooth.
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24
Repeat with white baking chips and remaining shortening.
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25
Drizzle over biscotti.
