After chopping up all the vegetables, add them to a large bowl.
Add the liquid egg replacer (or plant milk), together with the flour, potato starch, salt, pepper, onion, powder, and garlic powder. Add soy sauce and mix everything together.
In a medium non-stick pan, add oil over medium high heat. When the oil begins to shimmer, pour the entire contents of the bowl into the pan.
Cook for about 3 minutes, until the underside is golden brown. Flip using a large spatula. Sprinkle with sesame seeds. Cook for an additional 2 minutes and then flip once more.
Cook for 1 more minute and then remove from the pan. Cut into rectangular pieces.