Nutella® Biscotti

1 . Stage

Preheat the oven to 325 degrees F (165 degrees C). Position racks in top and bottom third of the oven. Line two large rimmed baking sheets with parchment paper and lightly spray with cooking spray.

2 . Stage

Whisk flour, cocoa powder, baking powder, and salt together in a medium bowl.

3 . Stage

Beat eggs in the bowl of a stand mixer fitted with a whisk attachment on medium-high speed until pale and frothy, about 2 minutes. Gradually add sugar and mix until pale and thickened, about 2 minutes. Beat in melted butter and vanilla on low speed until combined.

4 . Stage

Add chocolate-hazelnut spread and beat on low speed, scraping down sides and bottom of bowl as needed, until just combined, about 30 seconds. Gradually mix in flour mixture and on low speed until just combined, about 30 seconds. Fold in chocolate chips and hazelnuts until just combined.

5 . Stage

Divide dough in half. Place each half in the center of a prepared baking sheet. Lightly spray your hands with cooking spray and shape each piece of dough into a 3/4-x2 1/2-x13-inch log.

6 . Stage

Bake in the preheated oven, rotating cookie sheets halfway through, until set and firm to the touch, about 30 minutes. Remove from the oven and let cool on the baking sheets for 10 minutes. Reduce oven temperature to 300 degrees F (150 degrees C).

7 . Stage

Carefully transfer one log to a cutting board. Use a serrated knife to cut 1/2-inch slices on the diagonal. Transfer slices back to the baking sheet in an even layer, with cut-sides up. Repeat with the remaining log.

8 . Stage

Bake in the preheated oven until dried, about 30 minutes, flipping cookies and rotating baking sheets halfway through. Transfer biscotti to a wire rack and let cool completely, about 30 minutes.

9 . Stage

Meanwhile, microwave candy wafers in a medium microwave-safe bowl on high power for 30 seconds, then stir. Continue microwaving and stirring in 30-second increments, until melted and smooth, about 1 to 1 1/2 minutes total. Drizzle melted chocolate over one end of each biscotti.

10 . Stage

Refrigerate, uncovered, until chocolate hardens, about 15 minutes.