I'm impressed with your knowledge of the condition you have. Ulcerative colitis is aggravated by dairy because of high HCL production. I would use 3 scoops of a good whey protein, 1 cup of soy milk, 2 tbsp. of natural peanut butter, 2 bananas and 1/2 cup of oats. That will be a ton of quality nutrients and very high in calories. Good luck
Ryan