Phillys Best, 4320 E. Mills Circle Road (at Milliken), Ontario; also 4047 Grand Ave. (at Pipeline), Chino; and 806 E. Arrow Hwy. (at 57), San Dimas

Phillys Best (note shameful lack of apostrophe) is a chain of cheesesteak shops with 20 locations in SoCal, including three in the Inland Valley (see above). Because the number is so limited, Phillys Best qualifies under my ground rules here of focusing on mom and pop or relatively scarce chain restaurants.

I’ve been to the Phillys Best on the periphery of Ontario Mills a few times over the years. They have a range of steak sandwiches, hoagies, burgers and chicken sandwiches.

I visited this week for a mushroom steak with cheese ($7.50). It’s a hearty sandwich and like the others is served on a soft Amoroso brand roll from Philadelphia. I see in the fine print that the cheese is American and that you can substitute provolone or Wiz, as in Cheez Wiz, which cheesesteak-wise is technically more authentic, albeit disgusting.

They have above-average fries ($2) and, for people with East Coast tastes, Wise brand chips, Tastykakes and Frank’s Soda. The decor is sparse but includes boards listing Philly natives and Philly trivia and a blowup aerial photo of the city.

I haven’t been to Philadelphia and can’t judge how the cheesesteaks here compare, but they taste pretty good to me, and the result seems a lot more Philly than, say, Sbarro is to N.Y. If you’ve been, what do you think?