Grease your muffin pan with a little bit of oil or melted butter, set aside.
Sift together flour, baking powder, salt and cinnamon powder and keep aside to be used later.
In a separate bowl, whisk together butter and sugar until light and fluffy, about 3-4 minutes. Add in the egg or yogurt and whisk lightly until completely incorporated. Make sure you don’t whisk too much, if too much air is incorporated in the batter the muffins will sink after baking, so be careful!
Add in the vanilla essence and milk. Mix everything until you no longer see dry flour.
Preheat your oven at 180 degrees Celsius for 5 minutes.
Fill muffin cups until half full. Drop spoonfuls of Nutella in the centre and fill the muffin cups till the top.
Bake for 20 minutes at 180 degrees Celsius.
Recipe by Sugar & Spice by Radhika at https://sugarnspicebyradhika.in/nutella-stuffed-cinnamon-muffins/