Vanilla-Citrus Biscotti

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For the Cookies:

2 1/3 cups all-purpose flour

1 teaspoon baking powder

1/2 teaspoon salt

1/4 teaspoon baking soda

1 stick unsalted butter

3/4 cup granulated sugar

2 large eggs

1 1/2 teaspoons grated grapefruit zest 

1 1/2 teaspoons grated lemon zest

1/2 cup chopped candied orange peel

For the Glaze:

2 tablespoons unsalted butter

1 vanilla bean, halved lengthwise and crosswise, seeds scraped out

1 cup confectioners' sugar

3 to 4 tablespoons heavy cream

Silver nonpareils, for decorating