Who is the actor in Golden Corral commercial talking about wanting a steak and something else for under 10 dollars waiter says Problem it Dominic West from The Wire?

You're likely thinking of the Golden Corral commercial featuring actor Dominic West, who is most famous for his role as Detective Jimmy McNulty in the HBO series "The Wire."

In the commercial, he's shown ordering a steak and other items for under $10. The waiter tells him, "No problem," which is a memorable tagline from the Golden Corral commercials.

So you're right, it is Dominic West, and he does indeed say, "Problem?"