Start by preheating the oven to 350F then line a baking sheet with parchment paper then set aisde.
Cream the butter, brown sugar, and granulated sugar together until creamy.
Mix in the egg, and vanilla extract until combined, then add in the flour, baking soda, cocoa powder, and salt and mix just until combined.
Scoop out 7 equally sized cookie dough balls, flatten in between the palm of your hands, place the frozen Nutella in the center then fold the sides over, roll in between the palm of our hands, then roll the sides in the chopped pecans, place them on the baking sheet and gently flatten to about 1 inch in thickness.
Bake the cookies in the preheated oven for 10-11 minutes, top them with a generous amount of Nutella on top (you pick how much!) then let them cool on the baking sheet for another 20 minutes then transfer to a cooling rack.