Holsteins Shakes and Buns

Holsteins Shakes and Buns at the Cosmopolitan of Las Vegas is a restaurant that has taken the American burger and elevated it through premium ingredients, creative topping combinations, and an extravagant milkshake program that functions as a dessert course before the main event. The concept sits between fast-casual and sit-down dining in format — table service in a loud, energetic room that is calibrated precisely to the Cosmopolitan's upbeat identity — and it delivers on both halves of its name with genuine commitment. The burger patties are sourced from quality beef, ground to order specifications, and cooked on a flat-top that produces the characteristic crust texture that good smash burgers require. The O.M.G. Burger is the restaurant's signature: a composition of toppings including truffle aioli, Gruyère, and crispy onions that reflects the aspirational-casual approach of the entire menu. The bun selection changes periodically, with brioche, pretzel, and specialty options cycling through. The spiked milkshakes — which can include alcohol incorporated into the shake itself — are the most widely discussed menu item and function as either an appetizer or dessert depending on the order flow. Flavors including Biscoff Cookie Butter, PB&J, and rotating seasonal varieties are substantial enough to share. The Strip patio view of Las Vegas Boulevard is available from the bar area, and the restaurant is positioned as an all-hours casual destination that suits post-show snacking as well as full dinner service. The kitchen operates from 11 AM to midnight daily. No reservations are required.