Add the butter, sugar, cocoa powder, vanilla and milk to a saucepan. 

Heat it over medium heat and stir until melted and smooth. 

Remove from the heat. 

Add the Nutella and stir to combine. 

Add the quick oats and shredded coconut and mix to combine. 

Refrigerate for 30 minutes. 

Line a baking sheet with parchment paper. 

Drop the mixture by rounded tablespoonfuls onto the prepared baking sheets. 

Flatten the cookies lightly. 

Sprinkle with sprinkles (if using) and refrigerate until ready to serve.