I adore any soap with oatmeal in it, so making oat milk to use in soap has been on my to-do list for a while! To mix my lye solution, I used half of the water called for. I added the other half of the liquid as oat milk at trace. Unfortunately, the fragrance that I used accelerated; I know it was the fragrance and not the oat milk because the small portion of the soap what I kept unfragranced (for swirling) behaved beautifully. The acceleration meant that I was only able to quickly layer the soap instead of swirling it, but thankfully I had quite a bit of leftover unfragranced soap, so I was able to use it to texturize the top somewhat. The soap ended up gelling all the way through without any insulation. The fragrance I used was a dupe of Lush's Karma.