Line a large area of your kitchen counter or table with wax paper. Measure all ingredients out before beginning and keep them close by.
Add the butter, sugar, milk, and unsweetened cocoa powder to a large saucepan and heat over medium heat, stirring often until the butter is melted.
Bring the mixture to a rolling boil and allow to boil for exactly 90 seconds, stirring occasionally.
Remove from the heat, and stir in the Nutella and vanilla extract, add in the minute oats and stir until fully combined and oats are completely covered with the Nutella mixture.
Drop spoonfuls of the mixture onto the wax paper. Allow the cookies to cool for 20 to 30 minutes so they can set before enjoying.