These super soft and fluffy vanilla muffins are bursting with juicy blackberries and have a deliciously crunchy spiced hazelnut streusel topping! This recipe makes 6 jumbo-sized bakery-style muffins using the Tala 6 Cup Muffin Pan.
In a large bowl, stir the flour, golden caster sugar and baking powder together to combine. Set aside for now.
In a separate bowl, whisk the oil, eggs, milk, sour cream and vanilla extract together.
Pour the wet ingredients into the dry and gently fold the two together until just combined. Be extra careful not to overmix at this stage, a lumpy mixture with lots of air bubbles is what you're looking for.
Toss the blackberries in a tablespoon of flour until well coated (this stops them from sinking). Then fold them into the muffin mixture.
Divide the mixture evenly between the liners filling each one almost to the top. Set to one side whilst you make the spiced hazelnut crumb.
Stir the brown sugar, flour and cinnamon together in a bowl. Add the butter and use your fingertips to work it into the dry ingredients until it looks and feels like wet sand. Add the chopped hazelnuts and mix them through. Sprinkle the crumb on top of each muffin.
Bake for 8 minutes, then reduce the oven temperature to 180°C fan/200°C conventional and bake for a further 20-25 minutes. The muffins should look golden brown, have risen tall and spring back when lightly pressed.
Allow to cool for 5 minutes in the muffin pan, then transfer to a wire rack to continue cooling.
Enjoy your muffins warm and freshly baked, or store them in a baking tin for up to 2 days.
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Notes
These blackberry muffins are best enjoyed warm, freshly baked, but will keep for up to 2 days if stored in an airtight container.