Preheat oven to 450β.
Make Flax Egg: In a small bowl, whisk ground flax and water together. Set aside a few minutes allowing it to thicken.
In a blender: add flour, flax eggs, non-dairy milk, sugar, vanilla, cinnamon and a pinch of salt. Blend until very smooth. Batter may be thin. Pour into a bowl and set aside for 15-20 min to thicken.
Once batter has set, add 5 tbsp plant butter in oven-proof skillet. Place in oven to melt butter, a few minutes. Brush sides of the pan with melted butter.
Add batter to pan and cook for 15 minutes, or until sides start to golden and puff up.