Chocolate Chip Biscotti

A Great recipe from my dear friend  and big sister Jane:

1 stick (1/2 cup) unsalted butter, softened
3/4 cup sugar
1 tablespoon freshly grated orange zest
1/2 teaspoon vanilla
2 large eggs
2 cups all purpose flour
1 1/2 teaspoons baking powder
1/4 teaspoon salt
1 cup chopped pecans or walnuts
1/2 cup chocolate chips

Preheat oven to 325- degrees and lightly grease and flour a large baking sheet or line with parchment paper.
In a bowl with eletric mixer, beat together butter, sugar, zest and vanilla until light and fluffy. Add eggs, 1 at a time, beating well after each addition.
In a bowl, sift together flour, baking powder and salt and gradually beat into butter mixture, beating until combined well.
Stir in remaining ingredients. Chill dough 30 minutes.
Turn dough out on a lightly floured surface and halve. Form each piece into a flat log about 12 by 3 inches wide.
Arrange logs at least 3 inches apart on baking sheet and bake in middle of oven until pale golden, about 30 minutes.
Cool logs on baking sheet on a rack 5 minutes.
On a cutting board cut logs crosswise into 1-inch thick slices and arrange biscotti on baking sheet.
NOTE: any combination of dry fruits and nuts you like may be substituted. Enjoy.