Start by preparing the Nutella centers. Measure out 12 ½ tablespoons of Nutella, spreading them onto a parchment-lined baking sheet or freezable container. Place in the freezer for at least 1 hour, or until frozen solid.

In a mixing bowl, cream together the butter and sugars until light and fluffy. About 3-5 minutes on medium-high speed.

Add in the egg and vanilla extract, beating until well combined.

Gradually add the flour, baking powder, baking soda, and salt to the mixture, beating until a smooth cookie dough forms.

Fold in the chopped Kinder chocolate, Kinder Bueno and white chocolate chips until evenly distributed throughout the dough.

Using a scale, divide the dough into 12 equal portions, approximately 80g each.

Remove the frozen Nutella from the freezer. Flatten each portion of dough and place a frozen Nutella ball in the center. Wrap the dough around the Nutella to completely enclose it.

Chill the stuffed cookie dough in the freezer for at least 30 minutes or in the fridge for 1 hour.

Preheat your oven to 350°F (175°C) while the cookie dough chills.

Once chilled, place the stuffed cookie dough balls onto lined baking trays, spacing them apart to allow for spreading. You will want to have anywhere from 4-6 on each pan, depending on the size of your pan.

Bake in the preheated oven for 10-12 minutes, or until the edges are golden brown.