My dd needed 3000 calories to gain weight, to reduce the amount I had to add a lot of cream and butter to everything, adding in a high calorie smoothie/milkshake and pudding also made a big difference.
I could get one bowl of porridge up to 800 calories (normal portion size but only made with double cream not milk).
Lunch would be thick slices of toast with butter and things like scrambled eggs with double cream added.
Snacks had to be at least 300 calories (homemade cake is the way to go.)
I also decanted pretty much everything, you hardly get any crisps in a packet now so I’d be two bags in a bowl and give them to dd. Likewise with yogurts.
If they like nuts these can be really calorie dense as is peanut butter.
Yy to them regressing and not feeling able to make any decisions, my dd was like a little girl again and would follow me around needing constant reassurance.
I remember going into a cafe and her waiting for me to chose what she could have, anyone watching much have though wtf 🤯