Line an 9x 13 baking dish with parchment paper. Leave some hanging over the sides for easy removal.
In a medium sized bowl (or a large measuring cup), mix together all of the dry ingredients.
Using a mixer, whisk the butter until nice and smooth. Add sugars and continue to blend together on a medium-high speed. You want this nice and fluffy.
While the vegan butter is blending away, mix up the egg replacer in a small bowl. 2 teaspoon of Ener-G and 4 Tablespoons of water. Stir very well.
Add the egg replacer mixture to the butter/sugar mix.
Turn the mixer down and slowly add the dry ingredients to the wet.
Once well incorporated, add the vanilla.
Finally, add the chocolate chips and chia seeds (if using).
Plop the mixture onto the parchment paper and spread it out evenly.
Sprinkle with kosher salt.
Bake for 30-35 minutes. I like to pull it out around 30 minutes so they are nice and chewy.