Scoop the Nutella and place it on a parchment paper. Spread a little into a disc and freeze for at least 30 minutes.
For the cookie dough, add the soft butter and sugar to a bowl and mix using a spatula until pale and fluffy. This process is called creaming.
Next, add in the flour, cocoa powder, baking soda to the mixture and give it a mix.
Add in the milk and mix everything well to form a homogeneous and soft cookie dough. Let the dough chill in the fridge for 10 minutes for easier handling.
Press the cookie dough between your palms to flatten it and place the frozen Nutella disc in the centre. Fold the cookie dough and seal all around to make a smooth cookie dough ball.
Flatten the cookie slightly and place the chocolate callets on top.
Air fry at 170 degrees Celsius for 8-10 minutes. Let the cookie cool slightly.
Recipe by Bake with Shivesh at https://bakewithshivesh.com/nutella-lava-cookie/