"Soft and moist, these are the best blueberry muffins with streusel topping! The thick batter and high oven temperature trick guarantees tall muffin tops...."
INGREDIENTS
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1/2 cup (100g) packed light or dark brown sugar
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1/2 cup (67g) chopped walnuts (or pecans)
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1 teaspoon ground cinnamon
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1 and 3/4 cups (220g) all-purpose flour (spoon & leveled)
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1 teaspoon baking soda
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1 teaspoon baking powder
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1/2 teaspoon salt
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1/2 cup (115g) unsalted butter, softened to room temperature
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1/2 cup (100g) granulated sugar
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1/4 cup (50g) packed light or dark brown sugar
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2 large eggs, at room temperature
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1/2 cup (120g) sour cream or plain/vanilla yogurt, at room temperature