Fluffy and Moist Nutella Muffins

Combine the sugar with the butter and vegetable oil, add the 2 eggs, and mix until smooth.

Add a pinch of salt and vanilla, pour in the milk, stir in the sour cream, and mix thoroughly again.

Add the lemon juice and stir. Sift the flour together with the baking powder and fold it in to make the batter.

Fold in the chocolate chips, and lastly, add the baking soda and gently mix with a spatula. Cover and let rest for 10-15 minutes.

Preheat the oven to 400°F (200°C), bake for 5 minutes, then lower the temperature to 350°F (180°C). Bake for another 25-30 minutes. Check with a skewer; it should come out clean or with a few moist crumbs.