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1. Preheat oven to 375 deg F and spray muffin tins with nonstick spray.
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2. Combine flour, baking powder, baking soda, salt, and sugar in a medium bowl. Set aside.
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3. Melt butter in a small bowl. Set aside.
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4. In a large bowl, beat the eggs. Add buttermilk, oil, and vanilla extract.
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5. Slowly drizzle the melted butter into the buttermilk mixture, stirring constantly.
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6. Add the dry ingredients into the wet, and mix until just combined.
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7. Fold in the blueberries.
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8. Spoon the batter into the muffin tins and sprinkle the tops with Turbinado sugar.
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9. Bake mini muffins for about 15-17 minutes and the large muffins for 20-25 minutes.