Lactation Cookies and Tips

Hello all you beautiful mamas, just looking for a lactation cookie recipe please let me know what you use and if you notice a difference. How long before you noticed a difference? I feel like my milk is decreasing, just because my boobs are not as full. But my baby is 13 weeks and eats a ton so maybe that could also be a factor. I use to be able to pump out at least 5oz after a feeding. Now I am worried sometimes she isn’t getting enough. I drink tons of water, started taking fenugreek and have went back to oatmeal for breakfast. Any tips and recipes greatly appreciated! Thanks in advance ♥️