Preheat Oven: Preheat your oven to 350°F (175°C).

Prepare Phyllo Dough: Roll the phyllo dough out onto a large work surface. Place a 9×13-inch baking dish on top and trace around it with a sharp knife or scissors, cutting all the way through the phyllo to the work surface. Discard the extra phyllo and lift the pan. Phyllo dough should now be the size of the baking pan. Cover the phyllo with a damp cloth to prevent it from drying out.

Melt Ingredients: Melt the butter in a microwave-safe bowl. Melt the Nutella in another microwave-safe bowl.

Butter the Pan: Generously butter the 9×13-inch baking dish with some of the melted butter.

Layer Phyllo Dough: Place a sheet of phyllo in the bottom of the buttered dish, then brush with melted butter. Repeat with 5 more sheets of phyllo, brushing each with butter.

Nutella and Hazelnut Layer: Drizzle ½ cup of melted Nutella over the first 6 layers of phyllo dough. Spread evenly with a spatula. Sprinkle with 1/3 cup chopped hazelnuts and drizzle with ¼ cup honey.

Second Layer: Add 6 more sheets of phyllo dough over the Nutella layer, brushing each sheet with melted butter. Spread another ½ cup of melted Nutella over this layer, sprinkle with 1/3 cup chopped hazelnuts, and drizzle with ¼ cup honey.

Top Layer: Top with the remaining phyllo dough, brushing each sheet with melted butter.

Cut and Bake: Using a sharp knife, cut the baklava into 12 large even squares. Then cut each square diagonally to create two triangles, for a total of 24 baklava triangles. Brush the remaining melted butter over the top and sprinkle with the remaining chopped hazelnuts. Bake for about 30 minutes or until golden and crisp.

Drizzle with Honey: Remove from the oven and immediately drizzle the remaining ½ cup of honey over the hot baklava. Let it set for at least 2 hours.

Final Nutella Drizzle: Once the baklava has cooled, reheat the remaining Nutella and drizzle it over the top. You can place the melted Nutella in a small resealable bag, cut a corner, and drizzle it easily over the baklava.

Serve: Once the Nutella has set, cut and serve the baklava.