In a large bowl, whisk together the flour, baking powder, baking soda, cocoa powder, and salt.
In another bowl, mix the milk and vinegar. Let stand for about 2-3 minutes.
Add the flax, vanilla, and applesauce to the milk mixture. Whisk to mix well.
Pour the milk mixture into the flour mixture. Mix just until it's combined. Do not overmix. The batter will be lumpy. This ensures the pancakes cook up tender.
Heat the griddle.
Use a ⅓ cup to pour batter onto griddle keeping a small distance between them. Cook until the edges appear dry and bubbles appear on the center of the pancakes.
Flip each pancake over and cook until done.
To Serve, Place each serving of pancakes on a plate. Drizzle chocolate sauce over top.
If desired, add chia seeds, berries, and/or vegan whipped cream before serving.