Preheat oven to gas mark 3
Mix together the flax seed and water and let it sit for 5 minutes.
Cream together butter and sugars.
Stir in the peanut butter, vanilla extract, eggs and flax seed mixture.
Combine the flour, oats, brewer's yeast, baking soda and salt, and stir into the batter.
Mix in the chocolate chips.
Drop tablespoons onto a lightly greased baking sheet.
Bake for 15 minutes, until edges start to brown.
Let it cool for atleast 5 minutes before transferring to a plate.
If you'd like to make this recipe a little healthier for whatever reason, you can substitute some of the ingredients:
You can omit the peanut butter if you like, it is not an essential.
I use a 1:1 ratio for the flour and oats, meaning equal amounts. However, many lactation cookie recipes use 2 cups flour and 3 cups of oats. I find that it makes the cookies rather dry, and prefer it this way. If you really want to up your milk supply, I would definitely recommend going for the latter.