I have a kitchen light that is currently on a single-pole switch, with power entering at the switch and two-wire w/ground Romex going to the light. Can I safely add another switch and, using the existing cable in the wall and ceiling, power another separately-switched fixture? If so, can someone send me a wiring diagram? Thanks!

If adding a switch to existing switch box, you can power up the new switch with existing power, but you will have to run a new cable to get power to new light.

Chuck