Bursting Blueberry Crumb Cake

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Ingredients

2/3 cups flour (, plain/all-purpose)
½ cup caster sugar ((superfine sugar))
1/2 tsp cinnamon powder
1/8 tsp cooking/kosher salt
60g / 4 tbsp melted butter
1/4 tsp vanilla extract
1 1/3 cups flour (, plain/all-purpose)
2 tsp baking powder
1/4 tsp cooking/kosher salt
3/4 cup caster sugar ((superfine sugar))
1 tsp vanilla extract
1 tbsp lemon zest
2 large eggs
90 g / 6 tbsp unsalted butter (, melted then cooled slightly (don’t use piping hot))
1/3 cup sour cream (, at room temperature (sub plain yogurt))
1/3 cup milk (, at room temperature (full fat best, low fat ok))
500 g / 1 lb fresh blueberries ((Note 1 for frozen))
2 tsp lemon juice
2 tbsp caster sugar ((superfine sugar))
3 tbsp flour (, plain/all-purpose)

As published by RecipeTin Eats.

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