I was put on a liquid diet after an Esophageal Dilation and I totally understand the frustration of trying to find things to eat. I found potatoes and sweet potatoes to be a good option. I just made sure they were whipped up to a light consistency with no lumps.
I added plenty of milk to regular potatoes and can also make them into a creamy soup.
With the sweet potatoes, I added a little butter and brown
sugar (of course) and made sure to "smooth out in my mouth" when eating to strain out any stringy fibers of the potato.