What to do after a binge/eating a lot?

If it were me, I’d pick up as normal with the next meal. Since you slept through breakfast, have your normal calories for lunch and dinner.

If I know I'm going to do a big splurge like that, I'll generally eat 100-200 calories less for the few days leading up to it or for the few days after. The goal is to make up some or all of the excess calories, but not in a way that leaves me feeling hungry on the lighter days. Mind you, I'm on maintenance, and it's not that uncommon for me to come in a little under my maintenance level in a normal day, so if I've been pretty good for a while, then I may just call it a splurge day and return to normal with no extra action taken, too.

My advice: If (and only if) you're less hungry than usual, eat a little less than usual. If you're about the same as always, just eat your normal way. It won't matter in the long run.

Spend no more than 5 minutes thinking about the over-goal eating: Was it worth it? (If so, forget it, and go on.) If it' doesn't now seem like it was worth it, think about why it happened, make a plan for how you'd handle a similar situation differently in the future. Rehearse that new approach in your head a few times, then just go on with your day as normal. No more than 5 minutes on this thought process, and no self-recrimination!

Next time, under similar circumstances, if relevant, test drive your new plan with conviction.

It'll be fine.