I use (mostly) newspaper pots; 3 seeds to the pot. When up & starting to form true leaves, pick the weakest & snip--DON'T pull!--at soil level.
A few days later, repeat, keeping the strongest & ending up with 6 pots with one good seedling each.
Saves on space and pots, though if using peat pellets or such, there isn't enough room to space the seeds far enough away from each other.
I don’t know if it is thrift or what, but I plant 1 seed per pot. Fortunately, it has always worked and I get good, strong, plants. Sheer luck I suppose.
What is the diameter of your pots? I’m thinking of making some for fall and winter planting.