Preheat the oven to 400 °F. Lightly spray a 9-inch round pie plate or an 8x8-inch baking dish with nonstick spray.
Whisk together the flour, cornmeal, baking powder and salt in a medium-sized bowl.
In a second bowl, beat the egg with a whisk. Whisk in the skim milk, canola oil and melted butter.
Pour the wet ingredients into the flour mixture and stir it with a spatula until the wet and dry ingredients are fully incorporated.
Pour the batter into the prepared pie plate or baking dish.
Bake in the hot oven for about 20 minutes. The cornbread is done when a knife or toothpick inserted into the center comes out clean.