Ingredients
1/4 cup whole hazelnuts, toasted and skins removed1 large egg, room temperature1/3 cup sugar1/4 cup 2% milk1 teaspoon vanilla extract2 cups all-purpose flour1/4 cup baking cocoa1/4 teaspoon baking sodaDash salt2 teaspoons grated orange zest1/2 cup semisweet chocolate chips
Preparation
Preheat oven to 350°. Place hazelnuts in a resealable plastic bag; crush nuts using a mallet or rolling pin.
Beat egg, sugar and milk until light and thick; add vanilla. Whisk flour, cocoa, baking soda and salt; stir in orange zest. Gradually beat into egg mixture (dough will be thick). Fold in chocolate chips and crushed hazelnuts by hand.
On an ungreased baking sheet, shape dough into a 9x5-in. rectangle. Bake until a toothpick inserted in center comes out clean, about 20 minutes. Cool on pans on wire racks until firm, 5-10 minutes.
Reduce oven setting to 325°. Transfer baked rectangle to a cutting board. Using a serrated knife, cut crosswise into 1/2-in. slices. Place on baking sheet, cut sides down. Return to oven and bake until crisp, 6-8 minutes on each side. Remove from pans to wire racks to cool completely. Store in an airtight container.
