Smash Burger with Caramelized Onions

This smash burger delivers everything you crave: a deeply caramelized crust, juicy beef, melty American cheese, and sweet onions that have been slowly cooked to golden perfection. The contrast of textures—crispy edges against a soft bun, creamy cheese, and silky onions—makes every bite irresistible.

It's a quick, satisfying dinner that comes together in about 20 minutes, perfect for busy weeknights or casual weekends. Whether you're feeding a family or just yourself, these burgers are sure to become a favorite.

The secret to a great smash burger is all in the technique. Pressing the beef into a thin patty on a screaming-hot griddle creates maximum surface area, which means maximum browning—and browning means flavor.

The caramelized onions add a touch of sweetness that balances the savory beef and cheese, while the toasted buttered buns provide a sturdy, buttery base. This recipe uses simple ingredients you likely already have, but the results taste like something from a gourmet burger joint. Get ready for the best burger night of your week.

Ingredients

Why this recipe works

Smashing the beef on a hot griddle creates an incredibly thin patty with a large surface area. This maximizes the Maillard reaction, the chemical process that gives seared meat its deep, savory flavor and appetizing brown crust.

The high heat also renders some of the fat quickly, keeping the interior juicy while the exterior crisps up beautifully.

Caramelized onions are cooked low and slow to coax out their natural sugars, resulting in a sweet, jammy topping that contrasts perfectly with the salty, savory burger.

The buttered, toasted buns add a rich, crisp texture that holds up to the juicy patty without getting soggy. Together, these elements create a balanced, satisfying burger that's more than the sum of its parts.

Notes and substitutions

For the best flavor and texture, use ground beef with an 80/20 lean-to-fat ratio. The fat is essential for a juicy patty and helps create those crispy edges. If you can only find leaner beef, consider adding a little olive oil to the meat before cooking, but be careful not to overwork the meat—just mix gently.

A cast iron griddle or heavy skillet is ideal because it retains heat well and gets screaming hot, which is crucial for a good sear. If you don't have a burger press, a flat spatula works just fine—just press firmly and hold for a few seconds. Use a sturdy bun like brioche or potato rolls to hold up to the juicy patty.

• American cheese: Cheddar, provolone, or your favorite melting cheese
• Yellow onions: Sweet onions like Vidalia or Walla Walla
• Burger buns: Brioche buns or potato rolls
• Ground beef: Ground chuck or ground sirloin

Equipment

• Cast iron griddle or heavy skillet
• Flat spatula or burger press
• Basting brush
• Cutting board
• Chef's knife