There are several Worcester restaurants that serve classic American diner fare. Here are a few notable options:

1. Miss Worcester Diner: Located at 300 Southbridge St, Miss Worcester Diner is a historic Worcester landmark that has been serving classic American diner food since 1948. They offer a variety of breakfast options, burgers, sandwiches, and homemade desserts. You can check out their menu on their official website.
2. Lou Roc's Diner: Situated at 1074 West Boylston St, Lou Roc's Diner is known for its traditional American breakfast and lunch dishes. They serve all-day breakfast options such as pancakes, omelets, and French toast, along with hearty lunch specials like burgers, sandwiches, and salads. You can find more information on their website.
3. Gold Star Restaurant: Located at 68 W Boylston St, Gold Star Restaurant has been serving classic American diner fare since 1959. Their menu features a range of breakfast items, including eggs, pancakes, and waffles, as well as lunch and dinner options like burgers, sandwiches, and seafood dishes. Visit their official website for more details.

These are just a few examples of Worcester restaurants that offer classic American diner fare. It's always a good idea to check their websites or call ahead for the most up-to-date information on menus and operating hours.