Preheat the oven to 350 degrees Fahrenheit and line a baking sheet with parchment paper.
Mix the egg replacer or flax egg and set aside for 2-5 minutes before adding to mixture.
In a large bowl whip together the softened butter, sugar, and brown sugar until fluffy. Add the egg replacer and mix to combine.
In a medium sized bowl whisk together the dry ingredients (flour, salt, baking soda, and (optional) cinnamon.
Add the dry ingredients to the wet in 2 batches and mix until combined. Fold in the chocolate chips.
Optional: cover dough and place in fridge for 30+ minutes.
Roll dough into 1" balls and place about 2" apart on cookie sheet. Bake for 10-12 minutes, or until edges of cookies are slightly golden and center is still soft.
Remove from oven and let cool on cookie sheet for ~5 minutes before transferring to a wire cooling rack to cool completely.
Store leftovers in airtight container for up to 4 days. Enjoy!