I do a couple weeks of 3 day/week full body (squat/bench (or press)/deadlift) and play with the weights until I feel I’m back in the groove, but realistically I don’t think it matters how you do it so long as you start a bit too light and work your way back up to your previous volume (i.e., if you’re doing BBB don’t jump right into a 5x10… maybe start with just the basic 5/3/1 sets and slowly add a set or two of BBB each week until you’re back up to a full set of five.
Every time I restart I play it a little different. Sometimes I need more lead in… sometimes it feels great after only two or three sessions.