I’ve posted similar elsewhere, but when I am finishing a ride at home (either outdoors or the trainer) one of my go to quick pre-shower recovery meals is Oatmeal with a Banana and whey protein added in.
This gives me 27g carb, 5g protein (oatmeal), 23g carb (banana), and 11g protein (whey) - for 50g carb and 16g protein. Around the right ratio for a recovery shake and stays with you a bit longer to help keep me from over-eating post-ride