Using a spoon, combine flour, baking powder, baking soda, and salt in a bowl. Set aside.
Mix ground flax seeds and warm water in a bowl with a spoon and set aside for a couple minutes to coagulate.
In a separate bowl, add melted butter, sugar, flax mixture, milk, and vanilla extract and mix with spoon. Set aside.
Add the dry mixture to the wet mixture and mix until just combined. Set aside.
Over medium heat, pour ¼ of the pancake mixture to non-stick pan.
Cook until bubbles have formed on top of the pancake and the edges have discolored from the original batter color to flip.
Wait until the pancake has completely puffed down after the flip to transfer to a plate and assemble stacks.