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Preheat the oven to 400°F. Lightly grease the cups of a standard muffin pan (12 muffins); or line with paper baking cups, and grease the paper cups.
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Weigh your flour; or measure it by gently spooning it into a cup, then sweeping off any excess.
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Whisk together the flour, brown sugar, salt, baking powder, baking soda, and cinnamon. Stir in the blueberries last.
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In a separate bowl, whisk together the vanilla, vegetable oil, and buttermilk or yogurt.
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Pour the liquid ingredients into the dry ingredients, stirring just to combine.
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Spoon the batter into the prepared muffin cups, filling them full. A slightly heaped muffin scoop of batter is the right amount.
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Sprinkle the tops of the muffins with coarse sparkling sugar or cinnamon sugar, if desired.
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Bake the muffins for 18 to 20 minutes, until a toothpick inserted into the middle of one of the center muffins comes out clean.
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Remove the muffins from the oven, and after 5 minutes (or when they're cool enough to handle) transfer them to a rack to cool. Serve warm, or at room temperature. Store leftovers loosely wrapped at room temperature for several days; freeze for longer storage.