I don't pretend to be a nutrition expert, but I've recently taken some classes dealing with nutrition and learned a couple things. The main thing that helped me is amounts of nutrients to eat after riding. The material I was reading recommended you eat something that's approximately 3 grams of carbs for every 1 gram of protein, within a half hour of exercise (I've also heard within one hour). This surprised me, as I expected them to recommend much more protein, but apparently eating food with the 3 to 1 ratio will replace you blood glycogen levels, helping you to have energy for the rest of your day. In addition to that, since you have enough carbs, you won't be converting protein into energy, and any protein you do consume can go towards muscle repair and manufacturing all the enzymes you need and all that. They say that you really don't need an insane amount of protein, just a healthy amount and enough carbs to go with it so that you aren't wasting your protein on energy.

In addition, what others have said about making sure the rest of your diet looks good is really good advice too. Your body stores glycogen that you use as energy in various places (liver, muscles), and eating healthy is the best way to properly stock up. You'll definitely feel the difference out there on the road.

That being said, I do different things after riding. One thing I really like to do is cook up a pan of rice, add butter and seasonings, then stir in some black beans for protein. I'll usually cook up an amount the day before so it's ready to be microwaved as soon as I get home, and then have that for the next couple of riding days. It sounds really boring, but with the seasonings it's actually really tasty. You can also use couscous or quinoa in place of the rice, as those grains actually have a good amount of protein even without anything added. Another favourite is a breakfast burrito, and maybe a soda. It's definitely waaaay overkill post ride and more than replaces any calories I use. They usually have egg, chorizo, potatoes, cheese, and salsa. You're definitely getting more than enough of everything, but it's extremely satisfying and I feel great afterwards, although it's probably not the healthiest choice for keeping weight down. Fruit also feels really nice post-ride, I'll often combine that with whatever else I'm eating since the fruit doesn't have any protein.

I know this is far from professional nutrition advice, but anything I wrote here is something that helped me so I figured it was worth sharing. Hope it helps!