Preheat your oven to 230°C (210°C fan). Line a 12-cup muffin tin with paper cases.
In a medium bowl, combine 230g of plain flour, 1 teaspoon of baking powder (4g) and ⅓ teaspoon of bicarbonate of soda (2g). Whisk and set to one side.
Add 150g of sour cream, 100g of milk (not a typo - weigh the milk!) and 1 teaspoon of vanilla extract to a jug. Set to one side.
In a large bowl, cream 105g of room temperature butter, 1 tablespoon of oil (olive or vegetable), 170g of caster sugar and a ¼ teaspoon of salt (I use kosher) together until just combined and fairly smooth. I use my hand mixer.
Whisk in 70g of eggs (1 egg plus 1 yolk).
Scatter a third of the flour over the butter mixture and stir in gently using a spatula. Repeat until the flour has been used up. Don’t mix until completely combined. The mixture will be thick with dry patches of flour throughout.
Pour the sour cream mixture into to the flour mixture. Stir gently until mostly incorporated. Don’t overmix. The batter might look lumpy with a few dried flour patches. This is fine.
Use a table spoon (i.e. for cereal, not the measuring kind) to add 1 heaped spoonful of batter to each paper case.
Add 1 teaspoon of Nutella to each case then distribute the remaining batter, covering the Nutella.
Finally, top each cake with 1 heaped teaspoon of Nutella and use a skewer to swirl it into the batter.
Bake at 230°C (210°C fan) for 5 minutes then turn the oven down to 190°C (170°C fan) for another 10-13 minutes. The internal temperature will reach 96-100°C when fully cooked. A cake tester should come out clean but skewer from the side inwards to avoid the Nutella. Store the cakes for up to 3 days in an airtight container or, alternatively, freeze them.
Have you made Nutella Cupcakes?
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