Preheat oven to 350F

In a small bowl, combine ground flax or chia and water and let gel for about 5 minutes.

In a mixing bowl, cream together the vegan butter and sugar until smooth.

Add flax egg and vanilla and mix until incorporated.

Add bananas (now you can either lightly mash em and leave chunks, or you can smush them completely so they're completely incorporated into the cookie. I opted for the former).

Mix in the flour and baking soda.

Optional: add in the chocolate chips.

Spoon onto a parchment paper-lined baking sheet about 2 inches apart and bake for 8-10 minutes (the edges will start to brown and the tops will stop looking so wet).

Let cool on a wire rack.