Yeah, when I had time to be a gym rat I did post workout shakes all the time. I always thought of them as quick carbs and protien though. Getting that stuff into your bloodstream as quick as possible after the workout was the idea. For ski breakfast, I want slow release of carbs and protien. Of course I'm sure one could tune the shake more for slow release. Add some soluable fiber; casein instead of whey, a slower sugar source. Still, I like the idea of chewing on something for breakfast so a sandwhich and hardboiled egg helps. Also need a fat source if you want to stay full though. PB a good fat source and I think an Omega-3 egg is too.
Post workout is whey powder + carbs for that quick release.....but add a fat to it and that will make it slow digesting.....you can put the fat into the shake and you can still eat your HB egg too if you'd like.....