Mix all of the ingredients together except the Nutella and salted caramel.
Place muffin cases into the Pyrex Magic muffin tray and half fill the cases with the mixture.
Dollop a teaspoon of Nutella into the centre of each muffin case then top up with more mixture.
Bake at 190°C for 15-20 minutes until light golden brown.
Let the muffins cool and pipe salted caramel over the top of the muffin.