Minneapolis city limits, or just the general area?
Nala Pak has one to die for. That's Columbia Heights, though.
The salad bar at Fogo de Chao (Downtown) is absurd, but fun. I believe you can order it without the meat.
Marina Grill and Deli (in SE) is a bit hit or miss, but there are an awful lot of shots on goal, so you'll find something good.
New King Buffet (Brooklyn Center) is the best Chinese buffet I have had, and the only one where I have tasted any semblance of spice.