Preheat the oven to 350F. Line 2 baking sheets with parchment paper.
In a small bowl, make the flax egg by combining the ground flaxseed and warm water. Stir and set aside for 5 minutes.
In a medium bowl, combine the oats, baking soda, salt, and cinnamon. Stir to combine.
In the bowl of a stand mixer, beat the almond butter, brown sugar, flax eggs, and vanilla until smooth, about 2 minutes.
With the mixer on low, slowly add the oat mixture. Mix until combined. Stir in the chocolate chips. The dough will be very sticky!
Scoop 1.5 tablespoon rounds of dough onto the prepared cookie sheets. Bake each batch for 8-10 minutes. Cool 10 minutes on cookie sheet before removing. Transfer to a wire rack to cool completely. Enjoy!
Store leftovers in an air-tight container.