Prepare a baking sheet with a sheet of wax paper. (Or just lay out a piece wax paper on the counter.)

Add milk, sugar and butter to a large saucepan. Place the pan on the stove and heat on medium until the mixture begins to boil.

Allow the mixture to boil for one minute then remove the pan from the heat. (Really, just one minute!! It will make a difference in the consistency/dryness if undercooked or overcooked.)

Stir in Nutella and vanilla and continue to stir until well combined.

Pour oats over wet mixture and fold with a wooden spoon or spatula until the oats are covered with the Nutella mixture.

Use a tablespoon or cookie scoop to drop cookies onto the wax paper.

Allow cookies to rest at room temperature until they have set. (Approximately 30-45 minutes.)