Ingredients
Method
Preparation
- Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper and set aside.
- In a medium bowl, whisk together the flour, cocoa powder, kosher salt, and baking powder.
Mixing
- In a large mixing bowl, beat the room temperature butter until smooth and creamy. Add the light brown sugar and granulated sugar, and beat until light and fluffy, about 2-3 minutes.
- Add the egg yolks and vanilla extract to the butter-sugar mixture and mix until fully incorporated.
Forming Cookies
- Gradually add the dry ingredients into the wet ingredients in two additions, mixing on low speed just until the dough comes together.
- Scoop tablespoon-sized portions of dough and roll them into balls. Place on the prepared baking sheets, spacing them about 2 inches apart.
- Press an indentation into the center of each dough ball using your thumb or the back of a measuring spoon.
Baking
- Bake for 10-12 minutes, or until cookies are set around the edges but still soft in the center. If the indentations puff up, gently press them down right after removing from the oven.
- Let the cookies cool on the baking sheet for 5 minutes, then transfer them to a wire rack to cool completely.
Filling
- Once cooled, spoon a heaping teaspoon of Nutella into the center of each cookie. Sprinkle with chopped toasted hazelnuts while the Nutella is still soft.
Notes
For perfect cookies, ensure your butter is at room temperature. Use a small ice cream scoop for uniform cookie sizes. If the dough is too sticky, chill it in the fridge for 15-20 minutes.