Preheat oven to 400°F.
In a large bowl, whisk together the cornmeal, flour, baking powder and salt.
In a separate bowl, combine the plant milk, applesauce, maple syrup if using and apple cider vinegar.
Add the wet ingredients to the dry ingredients and stir just until combined. Don't overmix.
Pour the batter into a parchment-lined 8-inch square baking dish and spread evenly.
Bake for 20–25 minutes or until the top is golden and a toothpick inserted in the center comes out clean.
Let cool for a few minutes before slicing.