Not a drink…but something I do post big rides that end at home (trainer or otherwise)
Make a regular bowl of oatmeal and mix in a banana and chocolate whey protein
Comes out to around 375 calories - 275 from carbs and 100ish from the protein
If I’m racing or riding from my car I’ll often bring a thing of overnight oats (greek yogurt with raw oats and fruit stirred in) which gets me a similar ratio
I prefer whole foods over the mixes when I can get them (I eat a lot of processed carbs on the bike, so I’m rarely in the mood for a ‘shake’ of any sort right after a long ride).
That said - I do love the skratch chocolate recovery - it is just such a similar sweetness to gels, hydration, etc that I usually want something with a bit more substance (sometimes that’s a sweet potato, sometimes it is the things listed above)