Get the Nutella HERE!
Preheat the oven to 375ºF (190ºC). Line a Baking Sheet with Parchment paper.
In a mixing bowl, whisk together the flour and baking powder. Set aside.
In another mixing bowl beat the 2 eggs and the sugar on medium speed until lemon colored and foamy, about 5 minutes. Add the olive oil and vanilla and mix until fully incorporated. Add the flour mixture and mix until fully absorbed. The dough will be rather soft.
Flour your hands well. Take a rounded tablespoon of the dough and flatten it into a disk. Add about 1 teaspoon of Nutella to the center and fold the dough around it to seal. Place the cookies about 2 inches (5 cm) apart on the prepared baking sheet.
Beat the remaining 1 egg in a bowl. Brush each cookie with the egg wash. Bake for 12 minutes, or until the cookies are golden brown on top. Cool on a wire rack.