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San Mateo's Best Burgers
At heart, we’re burger lovers obsessed with quality. What began as a craving became a mission: serve juicy Wagyu smash burgers with fresh ingredients—no shortcuts. Smashed to order, crisp edges, melted cheese, toppings, and signature sauce make every bite bold, honest, and unforgettable.
Welcome to Smash Shack!
In Foster City and San Mateo, we’re serving more than burgers—we’re serving passion. Every Wagyu smash is crafted fresh, with crispy edges, melty cheese, and real flavor. No shortcuts, just bold, honest bites that make these two towns the home of your new burger obsession.
What Our Clients Say
Don't just take our word for it. Here's what our satisfied clients have to say about our Burgers!
"Tried Smash Shack for the first time through DoorDash and it did not disappoint. The burger was seriously so good, the meat was juicy, flavorful, and perfectly seasoned. Definitely ordering again!"
""I appreciate that they added a small cup of ketchup to dip my fries in, and the burger is delicious! Will definitely order from here again!""
"The best smash burger I’ve had in the Bay! Perfectly crispy edges, juicy Wagyu beef, and that sauce… unreal."
"Finally, a burger spot in San Mateo that doesn’t cut corners. Fresh, flavorful, and worth every bite."
"Stopped in on a lunch break and now I’m hooked. Foster City just became my go-to burger destination."
"Bold flavor, top-quality beef, and super friendly service. Easily my new favorite burger joint in the area."
Contact us anytime!
We are here to help you with any order issues, concerns, comments or just good vibes :)