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Smash burger with caramelized onions, melted cheese, lettuce, and pickles on a toasted bun

Smash Burger with Onions

This smash burger recipe with onions delivers crispy beef edges, caramelized onion flavor, and melted cheese on a toasted bun.
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Prep Time 10 minutes
Cook Time 10 minutes
Total Time 20 minutes
Servings: 4
Course: Main Course
Cuisine: American
Calories: 620
Ingredients Method

Ingredients
  

  • 450 g Ground beef, 80/20
  • 1 cup Yellow onion, thinly sliced
  • 4 piece Burger buns
  • 4 piece American cheese slices
  • 3 tbsp Mayonnaise
  • 1 tbsp Ketchup
  • 1 tsp Garlic powder
  • Salt and black pepper, to taste

Method
 

  1. Mix mayonnaise, ketchup, and garlic powder in a small bowl and set aside.
  2. Divide ground beef into 4 loose balls without compacting, then press a handful of sliced onions onto the top of each ball.
  3. Heat a cast iron skillet or griddle over high heat, place each beef ball onion-side down, and immediately smash flat with a sturdy spatula, seasoning the exposed beef side with salt and pepper.
  4. Cook for 2 to 3 minutes until the onions are caramelized and the edges are crispy, flip once, and cook for another 2 minutes until the internal temperature reaches 160°F / 71°C.
  5. Place one cheese slice on each patty, cover the pan for 60 seconds to melt, then remove patties and toast the buns cut-side down in the same pan for 1 to 2 minutes until golden.
  6. Spread sauce on the bottom bun, add the patty with onions and cheese, top with the bun, and serve immediately.