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Preheat the oven to 180c degrees and arrange paper cups in a muffin pan.
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In a mixer bowl with a paddle attachment, mix butter, sugar, salt and vanilla until you get a soft and creamy mixture.
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Go over the edge of the bowl with a spatula in order to bring the mixture to the center of the bowl and add in the eggs, one by one, whisking continuously until incorporated.
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Mix flour and baking powder in a small separate bowl.
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Add approximately 1/3 of the flour into the mixture while blending slowly.
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Add 1/2 of the milk while blending until it is mixed in the batter.
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Add another 1/3 of the flour while mixing, the remaining milk and finally the remaining flour. Once the mixture is smooth, stop mixing. It is important to avoid over-mixing which may damage the texture of the muffins.
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Add in the frozen blueberries and mix briefly only until evenly dispersed in the mixture.
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With a tablespoon or a large ice cream scoop, fill the jugs right up to their rim.
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Streusel topping: place sugar, flour, butter and salt in a bowl and blend with your hands until you get a crumbly mixture.
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Sprinkle crumbs generously on top of each muffin.
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Bake for 20-25 minutes or until the muffins are golden and set.
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Cool completely and serve.