Cream together butter, peanut butter, and sugars in a mixing bowl till creamy. Beat in eggs and vanilla.

In a small bowl, whisk together flour, soda, salt, and baking powder, then add to the wet ingredients. Stir till thoroughly blended.

Carefully add dollops of Nutella to the dough, folding it over gently so you can space them throughout the dough. Then use a knife to swirl the Nutella into the dough. You don't want to stir it too much!

Cover and chill the dough for about 30 minutes so the Nutella has a chance to set up. It can be refrigerated overnight as well.

Drop spoonfuls of dough onto lightly greased or silicone lined cookie sheets. Bake at 350° for about 10 minutes.