Preheat oven to 350 degrees F (176 C) and grease an 8×8-inch baking dish (adjust number/size of baking dish if altering batch size).
Prepare flax egg in a small bowl and let set for a few minutes to achieve an "eggy" texture. Measure out almond milk, add lemon juice, and let curdle for a few minutes. Then add baking soda and stir once more. Set aside.
To a large mixing bowl, add melted butter and sugar and whisk vigorously to combine. Then add applesauce and flax egg, and whisk once more. Next add almond milk mixture and whisk vigorously again to combine.
Add salt, cornmeal, and flour and stir with a spoon until just incorporated. It will look thin and somewhat lumpy. That's what you're going for.
Add batter to prepared dish(es) and bake for 28-37 minutes, or until the edges are golden brown and a toothpick inserted into center comes out clean.
Let rest in the baking dish for a few minutes before serving. I highly recommend serving these with just a touch of non-dairy butter and maple syrup or honey if not vegan.
*Nutrition information is a rough estimate calculated without additional toppings. *Note: You can learn more about the origins of cornbread here. *Recipe heavily adapted/expanded from my Vegan Cornbread for 2.