Is it possible to connect two breakers in one panel board

Two Pole Circuit Breakers Airpax two breakers in one slot A tandem breaker fits two individual breakers into the size of one That allows you to add new breakers when your breaker box doesn't have any new slots two slot toaster Flip both of them upside down and compare the slots on them where they slap into the busbar I bet the slot is much larger on the regular

two slot Remove one of the small 2 pole circuit breakers and put in a 30a or 40a 2 pole breaker and feed a sub-panel next to the current panel