Ingredients

Vegetable oil, for baking sheet 

3/4 cup whole wheat flour, spooned and leveled 

1/2 cup all-purpose flour, spooned and leveled, plus more for work surface 

1/3 cup sugar 

1 teaspoon baking powder 

1/4 teaspoon salt 

1/2 cup walnut halves 

1/4 cup golden raisins 

2 large eggs 

1 teaspoon pure vanilla extract 

Preparation

Preheat oven to 350 degrees. Brush a baking sheet with oil; set aside. In a medium bowl, whisk together flours, sugar, baking powder, and salt; stir in walnuts and raisins. Set aside.

In a small bowl, whisk together eggs and vanilla. Add to flour mixture; stir just until combined.

On a lightly floured surface, with floured hands, pat dough into a loaf about 1 inch thick, 2 1/2 inches wide (and about 7 inches long); transfer to baking sheet. Bake until risen and firm, 20 to 25 minutes; cool completely on sheet. Reduce oven temperature to 300 degrees.

Place loaf on a cutting board, and using a serrated knife, cut diagonally into 1/4 inch-thick slices; place slices in a single layer on sheet. Bake, turning once, until dried and slightly golden, 25 to 30 minutes; cool completely.