Warm up some Nutella in the microwave for 10 to 15 sec until it becomes soft and pipeable. Pour the warm Nutella into the piping bag and nip the tip of the bag into a 1cm hole. Pipe dollops of Nutella, about one tablespoon, onto a lined baking sheet and freeze them for half an hour to firm up.
1 cup Nutella
Sift all dry ingredients and set aside.
1¾ cup All-purpose flour, ⅔ cup Whole wheat flour, ¾ teaspoon Baking soda, ¼ teaspoon Salt
Beat the room-temperature butter with two sugars until creamy and light.
1 cup Butter, 1 cup Granulated sugar, ¾ cup Brown sugar
Add the eggs one at a time and beat well after each one. Add vanilla extract and mix.
2 Eggs, 1 tablespoon Vanilla extract
Add the dry ingredients and gently mix. Do Not Overmix the dough. Use an ice cream scoop or spoon to make a ball of about 30 grams or two tablespoons.
Flaten the dough on the palm of your hand, place one piece of the frozen Nutella in the middle, fold the sides of the dough over the Nutella, and roll the dough between your hands to make a round ball. Place the dough balls on the lined baking sheet and chill them for half an hour.
Preheat the oven to 350℉ and line two baking sheets with parchment paper.
Space the dough balls on the lined baking sheet with two inches of space between them. Sprinkle their top with some crushed hazelnut and gently press the nuts down.
½ cup Hazlenuts
Bake the cookies for 10-12 minutes until their edges are set and slightly golden. Let them cool on the baking sheet for 10 minutes, then transfer them to the cooling rack using an offset spatula or serving spatula. After they are fully cool, drizzle their top with more Nutella.