The Best Smashburger in Louisville, Colorado

The smashburger has taken Colorado by storm, and honestly, it makes sense. There's something about pressing a loose ball of ground beef hard against a screaming-hot flat-top and watching it caramelize into a thin, lacy-edged patty that regular burgers just can't match. We've been making ours this way since we opened in 2020, and at our counter inside Relish Food Hall in Louisville, CO, it's still the thing people drive across Boulder County for.

What actually makes a smashburger different

A true smashburger isn't just a flat burger. The smash has to happen fast, while the beef is still cold, on a surface that's genuinely hot. 450°F or above. That contact creates the Maillard reaction across nearly the entire surface of the patty, not just the edges. The result is more crust, more caramelized beef flavor, and dramatically less grey interior. You get a burger that's fully cooked without being dry.

It also changes the texture in a way that's hard to explain until you've had one. The edges get lacy and almost crispy. The center stays juicy. The cheese melts from the bottom up because it goes on while the patty is still in contact with the grill. It's a better burger. Just is.

How we make the MFB Smashburger

We use Colorado angus chuck, 80/20, never leaner, formed into loose balls and smashed to order on our flat-top. Sharp American cheese goes on immediately after the smash so it melts into the beef. Special sauce, crisp lettuce, tomato, red onion, and a dill pickle on a parmesan toasted brioche bun.

The brioche gets toasted in butter on the flat-top and pressed gently until it's golden. It holds up without going soggy, which is the other thing most burger buns fail at.

Ours comes double-stacked. Two patties, two cheese slices, one bun. You can add crisp bacon (+$2), go for a third patty (+$3.25), swap to a gluten-free bun (+$2.75), or load on grilled onion or mushroom (+$0.50). It comes with house-made fresh fried potato chips, or sub shoestring fries or crispy tots for $2.

The MFB Smashburger: $16.25

We set the price to reflect what goes into it: Colorado beef, real brioche, fresh vegetables, and a sauce we make ourselves. A smashburger at this price point at a fast-casual counter in Louisville is a fair deal. You're getting restaurant technique without restaurant overhead.

If it's your first time, order the double smash straight with no modifications. Get to know the burger before you start building on it. Then come back and try it with bacon and jalapeños.

Find us at Relish Food Hall in Louisville, CO

We're inside Relish Food Hall & Pickleball at 550 McCaslin Blvd, Louisville, CO 80027. Open Monday through Sunday, 11am to 8pm (9pm on Fridays and Saturdays). Order ahead through GoTab or walk up to the counter.

If you've been looking for the best smashburger in Louisville, Colorado, or a great burger near Relish Food Hall, we'd love to be your answer. Come hungry.