In a large bowl combine sourdough discard, egg, peanut butter, and maple syrup.
Add in oats, cinnamon, salt, baking powder, flaxseed, and chocolate chips. Mix to combine.
Scoop onto a baking sheet and gently press down to desired thickness, these will not spread much. I like to make 6 large cookies vs 12 smaller cookies.
Bake for 14-15 minutes for large cookies or 10-12 minutes for smaller cookies.