Preheat your oven to 375 degrees.  

In a small mixing bowl, combine flour, baking soda, and salt.

In a separate bowl, or in your stand mixer, cream butter, sugar, and brown sugar together until smooth.

Add egg and vanilla, and mix well.

Add Nutella and mix until creamy.

Gradually add dry ingredients until combined into a nice workable cookie dough.

With a cookie scoop or spoon, make walnut size balls and roll in sugar. 

Place cookie balls on a parchment-lined tray.

Bake in preheated oven for 8 minutes. 

Remove from oven and cool on wire rack.