I can NOT chew food. Due to a brain surgery last year, I lost jaw closure so diet is soft foods or a crap load of shakes

question is:
because I use it to help with a meal replacement, what is better to use, muscle milk or protein powder?
Im not fully new to work out things and did protein powder for a long time after working out. But after surgery I felt I needed 'more' since I cant eat so much now. So ive been using muscle milk powder to shakes. And I even did the math to all that I add to it and your looking at a 7-900 calorie shake LOL mind you, im 27 and 125 pounds and over the course of past year(since surgery) ive only gained 3-5 pounds bc that shake is filling and im only on a 3 meals a day and before bed snack atm. But im here now to figure out if its to much.
I had to start with this shake while im learning what I CAN manage to digest. I put a packet of instent oatmeal in the cup, scoop of muscle milk, 3 SMALL ice cream scoop fulls of peanut butter and about 5 to 6 scoops with same small ice cream scooper. I fill the rest with 2% milk.
Im starting to think, now that im able to really start trying again and finding more to eat, that I should either go back down to protein powder or maybe split this shake in two and spread it out so its not consumed all at once. This shake is the one major thing just keeping weight but now that I plan to start working out, I wanna figure out if protein powder would be better to stay with?
Due to the surgery(ill explain more in profile of it shortly) I got a fractured back and I was unable to stand from sitting on floor, by myself, for a few months after surgery. So right now I dont workout much. But once I get a better handle of meds I take and the food I eat I will then come back here to figure out a workout routine with the equipment I have at home.
Thanks for any advice!