Nutella Hot Chocolate! Boom! Sure you can easily just toss that empty Nutella jar in the trash. The jar may appear empty but trust me, there is just enough for another Nutella treat! Gently heat milk in a saucepan or a microwave-safe mug. Carefully pour the warmed milk into the empty Nutella jar. Place the lid on securely and give the jar a good few shakes. The warmed milk will melt whatever leftover Nutella is left on the inside of the jar. Once it's all mixed together, pour it back out into a mug.