Preheat oven to 350 degrees. In a large bowl, mix up your ground flax seed meal and water and let sit for a few minutes so it can gel up.
Once the flax egg has reached an egg like consistency, add the creamy peanut butter, sugar, baking soda, and salt and mix until well combined. Stir in the semisweet chocolate chips.
Chill the dough for about a half hour. Then drop dough, about a tablespoon at a time on parchment lined cookie sheets.
Bake until cookies are golden, 12 to 14 minutes. These cookies are fragile when warm, so cool for about 10 minutes on sheets; transfer cookies to racks to cool completely.
Notes
These will keep in an airtight container for up to a week, but they are best consumed within a few days.