Sourdough Blueberry Muffins
Ingredients:
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1 cup fresh blueberries
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2 teaspoons all-purpose flour
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1 cup all-purpose flour
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1 teaspoon baking soda
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½ teaspoon ground cinnamon
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¼ teaspoon salt
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1 cup sourdough starter, at room temperature
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¼ cup white sugar
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1 egg
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¼ cup unsalted butter, melted and cooled
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1 teaspoon vanilla extract
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½ cup white sugar
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⅓ cup all-purpose flour
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¼ cup unsalted butter
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1 ½ teaspoons ground cinnamon