Preheat the Oven: Preheat your oven to 350°F (175°C). Line an 8x8-inch baking dish with parchment paper to prevent the cornbread from sticking and ensure easy removal.
Prepare the Flax Egg: Mix 1 tablespoon of ground flaxseed with 3 tablespoons of water in a small bowl. Stir well and let it sit for 5-10 minutes until it forms a gel-like consistency.
Mix the Dry Ingredients: In a large mixing bowl, whisk together the cornmeal, oat flour, tapioca starch, baking powder, and salt (if using). Ensure the ingredients are well combined to ensure an even distribution of the leavening agent and a consistent texture throughout the cornbread.
Combine the Wet Ingredients: In a medium mixing bowl, whisk together the plant-based buttermilk, unsweetened applesauce, maple syrup, and the prepared flax egg. Mix until smooth and well combined.
Combine Wet and Dry Ingredients: Pour the wet mixture into the dry ingredients. Use a spatula to gently fold the wet and dry ingredients until combined. Be careful not to overmix, which can lead to a dense texture. The batter should be slightly lumpy but well incorporated.
Bake: Pour the batter into the prepared baking dish, spreading it evenly with a spatula to ensure a uniform thickness. Bake in the preheated oven for 25-30 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean. The edges should be slightly crisp, adding a delightful texture contrast.
Cool and Serve: Allow the cornbread to cool in the baking dish for 10-15 minutes. This cooling time helps the cornbread set and makes it easier to slice without crumbling. Once cooled, slice into squares and serve warm or at room temperature. Enjoy your delicious, fluffy cornbread as a side dish or a satisfying snack.