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Preheat oven to 350 degrees.
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Line around 16 muffin tins with cupcake liners or spray with nonstick cooking spray.
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In a large bowl; combine flour, sugar, salt, and baking powder.
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Beat in milk, egg and lemon extract until smooth.
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Carefully stir in blueberries and lemon zest.
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Spoon batter into cupcake tins until around 2/3 full.
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Prepare crumb topping:
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In a small bowl; combine flour, sugar, cinnamon and melted butter.
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Add more butter or flour if necessary until mixture has a crumb texture.
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Sprinkle crumbs over muffin tops.
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Bake for around 20 minutes or until toothpick comes out clean.
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Allow muffins to cool completely.
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Prepare Lemon Glaze:
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Beat together powdered sugar, milk, lemon extract and lemon zest.
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Drizzle glaze over the tops of each muffin using a teaspoon.
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Allow glaze to harden for several minutes before serving.