Weigh out the ingredients
I
You'll need chocolate, flour, brown sugar, granulated sugar, eggs, cocoa powder, oil, Nutella, salt, baking powder, and vanilla extract.
Mix dry ingredients
II
In a small bowl, combine the flour, cocoa powder, baking powder, and salt. Set aside.
In a medium heat proof bowl add the chocolate and oil, and place over a small saucepan with simmering water. Stir occasionally until completely melted. Remove from heat and set aside.
Heat chocolate & oil
III
In the bowl of a stand mixer fitted with the whisk attachment, whip the granulated sugar, brown sugar, eggs, and one teaspoon vanilla on high speed for 2-3 minutes until light and pale in color.
Whisk wet ingredients & sugar
IV
While mixing on low speed, drizzle in the melted chocolate mixture and mix until fully combined.
Add melted chocolate
V
Lastly add in the flour mixture and mix until just combined. The batter should be soft, but able to hold a ball shape when scooped.
Add dry ingredients
VI
Immediately scoop the batter onto the prepared baking sheets about two inches apart. Inject each cookie dough ball with Nutella.
Scoop & inject
VII
Bake the cookies for about 8-10 minutes until they are crackly, shiny, and appear set. Allow to cool completely on baking sheet.
Bake & cool
VII