Leave the protein meals until the post-ride dinner.
Whey protein mix gloops up with heat.
I drink it as a super-thick, ice cold milkshake with Crusha syrup.
Most supermarkets sell a tray of flapjack for around a quid. I stopped making my own years ago.
If you really want a treat, Holland & Barratt or GNC sell 80g protein bars. I like the choc chip cookie variety. The choc chip is not chocolate, carob more like.