Preheat oven to 400º F.
Grease muffin cups or line with paper muffin liners.
In a large bowl, combine flour, cornmeal, sugar, salt, baking powder and baking soda. In a separate bowl, beat together oil, vanilla, and egg. Stir egg mixture into dry ingredients alternating with the buttermilk. Gently fold in blueberries. Spoon batter into prepared muffin tins.
Bake 20-25 minutes, until golden. Makes 12 muffins.
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