Maybe i should try toasted oats...to toast and then cook...
I'm living in Chile and they have a toasted wheat flour like you said, and they seem to drink it right after mixing it with milk. I'm not sure if that's a good idea for endotoxin. But is easy as f... to add calories and carbohidrates that way, you could add easily three or four full tbsp of flour that way.
If you cook it will thicken and will look like prison food xD
What would be the problem in regards to endotoxins?