Keystone Corner Lunch - (Near St Marys, PA)

5 /5 Kelli R: We travel a lot and have tried a lot of different burger places but the Corner Lunch definitely takes the cake! The smash burgers were great, seasoned well and had the perfect smash burger crisp. A great variety of options for toppings! Beer cheese and bacon fries were delicious, fries were awesome. Banana cream pie shake was perfect. Overall the best burger and fries we’ve had anywhere. Staff was very kind and welcoming as well!

5 /5 Jessica Bayne: Everything about this place!!!! This is the best food I’ve gotten since visiting Pennsylvania! I’m so highly satisfied! My husband is raving! This is genuinely amazing, and was the staff! AMAZING!!!!

5 /5 Robert Beveridge: This little diner has some killer food. I was in St Marys for work. I like to try new places and dishes. They have a such a great selection of burgers and dogs I had to come again just to try more of the ones I wanted.... Everything Ive had was great.

5 /5 Meredith Dole: Small joint, with cute diner atmosphere. The food was FANTASTIC. A large to go order came in before we placed our order, and the kitchen worked diligently to complete all orders before and after ours. The smash burger I had exceeded my expectations, the kids meals were good portions and my kids enjoyed them. My husband also really enjoyed his burger. We shared a large poutine that was not light on anything- heavy on the fries, gravy, cheese, chives, and flavor. Service was kind and accommodating, cheerful and gracious. Worth the 45 minute drive for us. We will definitely be back.

5 /5 Christian: If you are coming to the reviews to see if you should eat here, then you should. We ordered food from here on a whim when passing through, using their online ordering service. By the time we made it to the restaurant our food was done and bagged up, ready to be picked up. We were eating in the car while traveling home, so they gave us extra napkins and silverware. I get excited when ordering from new restaurants and tend to over order, just so I get a big variety and so that I can appropriately rate the establishment on more than one dish. Todays order included: Smoky Garlic Cheese & Bacon Jam Dog $4.99 Patty Melt $10.74 Chicken Bacon Cheddar Wrap $9.49 Single Burger $7.74 Chili Cheese Fries $7.99 Buffalo Chicken Wrap $9.49 There wasn’t a thing we ordered that we didn’t like. I’d get each of these items again and would love to try everything else on the menu. The chili cheese fries were bomb. The flavor was great, the French fries still had a bit of crisp to them and weren’t all soggy, the chili had a little bit of a kick (so good) but not spicy, the cheese sauce tasted homemade as it had flavor and was seasoned, and it was topped with fresh onions. Order these and share them with a friend or just keep them all to yourself. The large was huge and there was enough toppings to have a bite with each fry. They nailed this. The patty melt was awesome, wasn’t fry, had great flavor. The wraps both were great, they used mixed greens (such a plus in my book) and I ordered ranch with both and it was homemade. That elevated my whole experience as I do not like store bought ranch very much, but could swim in homemade ranch. My kiddo had the burger and thoroughly enjoyed it and my husband smashed the dog pretty quick, so I’ll never know what that tasted like. 10/10 - quality, price, taste, portion size. STOP here and rate this establishment!! You will be glad you tried their food.