You can make a separate flax egg first, by adding about 4 tbsp of water to 2 tbsp flax meal and letting it sit for about 5 minutes. But you can also just throw everything in a bowl, like I did.
Now grab a bowl and add the flax seeds, non dairy milk, butter/vegetable oil, agave, vinegar and vanilla extract. Whisk well and let it sit for about 5 minutes. After this you can add the baking powder, soda and flour and whisk until you get a nice thick batter.