Mine are a little older now, and seem a bit more tired when they first go to bed.

But when they were younger I did find one at a time easier. I'd do the dinner (early, like 5), then play, then tidy up, book, then shower, teeth etc. I would then pick the tired one and we'd all go to his bed and read one or two books. Then the other one would go out of the room (same room never ever worked in this house) and sit in the lounge with an audiobook on their own headphones ($20 from **** smith). They can't walk around much because the headphones and MP3 player restrict their movement a bit. They rarely muck up with them on. No tv at this stage. If I did offer tv, it was always before the bath bit.
Then sit with the tired one until he was almost asleep. Then sit with the other less tired one until the audiobook was over, or start another short book - reward for being quiet whilst I dealt with first child.
Then bed for the second child.
Then pretty much what Snacks said. Lol.

With my older son I used to say to him mummy's going to have a shower now, so I'll come back and check on you and give you water/blanket/dinosaur/whatever in ten minutes after my shower. He seemed to go with this a lot and then sometimes he'd fall asleep and sometimes not, but at least he'd been calm for the previous 10 minutes or so.

I kinda followed this routine when DH was home too. Then they knew that they couldn't get me to give them treats or special treatment when I was on my own.

Bear in mind, this didn't always work. Nothing is ever fool-proof. But it was always what I tried to do.