Lactation brownies are a great (and delicious) way of increasing milk supply!
The three ingredients that may help boost milk supply are rolled oats, flaxseed, and brewer's yeast.
Making these are pretty simple - basically, you just stir together the wet ingredients and then add the dry one. Full recipe is linked below.
Fold in the rolled oats and chocolate chips, and stir well.
Fold the brownie dough into a 9x13 pan and bake at 350 for 20-23 minutes.
Full recipe linked below along with answers to common questions!