Preheat oven to 350. Line two mini muffin pans with paper liners and set aside.
In a medium bowl, whisk together flour, baking powder, and salt. Set aside.
In a large bowl or the bowl of a stand mixer, cream butter and brown sugar together on medium speed until well-combined and fluffy, about 2 minutes. Add eggs one at a time, beating each until combined. Beat in vanilla.
Turn off the mixer and add the flour mixture. Beat on low speed until just incorporated. Fold in chocolate chips with a spatula.
Place about ½ tablespoon of batter in each cup. Dollop about ½ teaspoon of Nutella into the center of each. Then top with another teaspoon or so of batter.
Bake for 12-14 minutes, until lightly browned. Cool completely in pans.
Recipe by Baked In at https://www.baked-in.com/2012/10/08/nutella-stuffed-chocolate-chip-cookie-bites/