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Yes you can and it delivers a much better experience than watching a laptop screen.
You will need some or all of:
A minidisplay port to HMDI adapter
An HDMI cable that's long enough to place the MBP comfortably away from the Plasma
The audio will depend on the model you have, the latest deliver the audio across the HDMI but all earlier models will need either:
A TosLink (digital audio cable from MBP to Plasma - if it has that input) or
A stereo/headphone jack to 2 phono plugs - if that's what your TV has
If it's some other set of inputs on the Plasma post details and we can identify what's needed.