In a large coffee cup or small microwave-safe container (minimum 350 ml), mix the flour, cocoa powder, sugar and salt.
Add the milk, vegetable oil and vanilla extract. Mix well until you get a homogeneous mass without lumps.
Add the chocolate chips and mix gently. Add a tablespoon of Nutella and mix gently.
Cook in the microwave at maximum power for 1:30 to 2 minutes, depending on your microwave.
The center should be cooked but slightly damp, brownie type.
Cool down a little and enjoy!
