Freeze 6 dollops of chocolate fudge sauce on a parchement-lined baking sheet or plate. Each dollop will be about ½ tbsp.
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 6 equally sized cookie dough balls, flatten each one in between the palm of your hands, place a frozen dollop of chocolate fudge, fold the cookie dough over it, place on a baking sheet, and gently pat the top, leaving the cookie at about 1-1.5 inch in thickness
Bake the cookies in the preheated oven for 10-11 minutes then let cool on the baking sheet for another 20 minutes then transfer to a cooling rack. Dust with powdered sugar and enjoy!