Preheat your oven to 350°F (175°C).
Grease and line a 9x13-inch baking dish or a similar-sized pan with parchment paper.
In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
In another bowl, mix the applesauce, plant-based milk, melted coconut oil, vanilla extract, and lemon juice.
Add the wet ingredients to the dry ingredients, stirring until just combined.
Pour the batter into the prepared pan and spread evenly.