Preheat the oven to 400°F. Place skillet in oven as it is preheating.
In a large bowl, mix together the cornmeal, flour,sugar,baking powder,salt and baking soda. Whisk in the milk, oil and eggs until evenly combined.
Remove skillet from oven and use 1 teaspoon butter or oil to grease the pan. Pour batter into skillet or pan and bake 25 - 35 minutes, until top of cornbread is golden and is pulling away from the sides of the pan. The top of the cornbread will be firm to the touch.
Remove from the oven and allow to cool slightly before serving.
Note - whole or 2% milk can be used for this recipe.Note - regular vegetable oil can be substituted for canola oil