Preheat oven to 400°F Grease a 12 cup muffin pan or line with paper liners.
Combine flour, cornmeal, baking powder and salt in a large bowl. Add next 4 ingredients. Stir just until combined. Add frozen blueberries. Stir lightly until blueberries are combinedd in batter. Spoon batter into prepapred muffin pan and sprinkle with coarse sugar.
Bake in preheated oven 18-20 minutes or until a toothpick inserted in center comes out clean.