Preheat oven to 400.

Place 6" cast iron with 1 tablespoon oil in oven

Or grease 8" pie plate or pan and set aside

Combine cornmeal, flour, sugar, baking powder, and salt in a bowl

Mix 1/2 cup oil, eggs and milk and add to dry ingredients

Mix just till uniform

Add blueberries, gently mix in

Let sit 5 minutes

Pour into pan and sprinkle with 1 tablespoon sugar

Bake 20-25 minutes, until top is golden