There is something magical about a perfectly smashed burger. Juicy beef, melty cheese, sweet caramelized onions, and a creamy special sauce all piled on a toasted bun. This version uses Hellmann’s mayonnaise in both the onions and the sauce for extra richness. It is fast, messy, and completely satisfying. One bite and you will understand why smash burgers are so addictive.
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Why you’ll love this recipe
This smash burger delivers big flavor with simple ingredients and quick cooking.
- Juicy beef with crispy, caramelized edges
- Sweet onions cooked in mayonnaise
- Creamy homemade special sauce
- Ready in under thirty minutes total
Ingredients
Gather these simple ingredients for juicy smash burgers topped with rich onions and special sauce.
- 1 lb ground beef
- 4 burger buns
- 2 large onions
- 4 slices American cheese
- ½ cup Hellmann’s mayonnaise
- 2 tbsp mustard
- 2 tbsp ketchup
- 1 tbsp Worcestershire sauce
- 1 tsp black pepper
- Pickle slices
- Salt to taste
If you prefer a sharper flavor, swap American cheese for cheddar. No Worcestershire? A splash of soy sauce works fine. Any neutral oil can replace a light mayo coating on the griddle if needed for searing.
Worth trying next: Potato-Stuffed Meatballs Baked in Cheesy
Step-by-step instructions
Follow these clear steps to build the ultimate smash burger with caramelized onions and sauce.
Step 1: Caramelize the onions
Heat a skillet and add sliced onions with a squeeze of Hellmann’s mayonnaise. Stir until soft and golden, then add a dark liquid for deeper color and cook until sticky and sweet.
Step 2: Mix the special sauce
In a bowl combine mayonnaise, mustard, and ketchup. Season with pepper and a dark sauce, then whisk until smooth and creamy for the perfect burger topping.
Step 3: Form the beef balls
Divide the ground beef into equal portions and gently roll into loose balls. Keep them cold so they smash cleanly and develop a great crust on the hot surface.
Step 4: Smash the patties
Place each ball on a hot griddle and press hard with parchment and a spatula. Season generously with salt and pepper while the first side sears.
Step 5: Flip and add cheese
Once the edges are crispy, flip each patty carefully. Immediately top with a slice of American cheese so it melts over the hot meat.
Step 6: Toast the buns
While the cheese melts, place the buns cut-side down on the griddle. Toast until golden and lightly crisp for better structure and flavor.
Step 7: Sauce the bottom buns
Spread a generous spoonful of the special sauce on each toasted bottom bun. This creates a creamy base that holds the toppings in place.
Step 8: Assemble the burgers
Add pickle slices, the cheesy patties, and a pile of caramelized onions. Crown with the top bun and press gently before serving immediately.
Smash Burger with Caramelized Onions and Special Sauce
Equipment
- 1 | Cast-iron griddle or skillet |
- 1 | Metal spatula | for smashing
- 1 | Wooden spoon | for stirring onions
- 1 | Mixing bowl |
- 1 | Whisk |
- 1 Tongs
Ingredients
- 1 | lb | ground beef | 80/20 preferred
- 4 | | burger buns |
- 2 | large | onions | sliced
- 4 | slices | American cheese |
- 0.5 | cup | Hellmann’s mayonnaise | divided
- 2 | tbsp | mustard |
- 2 | tbsp | ketchup |
- 1 | tbsp | Worcestershire sauce |
- 1 | tsp | black pepper |
- | | pickle slices | to taste
- | | salt | to taste
Instructions
- Slice the onions and cook them in a hot skillet with a squeeze of mayonnaise until soft and golden.
- Add a splash of dark sauce to the onions and continue cooking until deeply caramelized and sticky.
- In a bowl, mix mayonnaise, mustard, ketchup, pepper, and Worcestershire sauce until smooth.
- Divide ground beef into 4 equal balls and keep cold.
- Heat a griddle until very hot. Place a beef ball down, cover with parchment, and smash firmly with a spatula.
- Season the smashed patties with salt and pepper. Cook until edges are crispy, then flip.
- Top each patty with a slice of cheese and let it melt.
- Toast the buns cut-side down on the griddle until golden.
- Spread special sauce on the bottom buns, add pickles, cheesy patties, and caramelized onions. Top with the remaining buns and serve.
Notes
Reheat patties briefly on a hot skillet to restore crispness.
Onions can be made a day ahead and reheated gently.
Use parchment paper when smashing to prevent sticking.
Tips & common mistakes
A few small details make the difference between good and great smash burgers.
- Smash hard and fast for maximum crust
- Do not move patties until they release
- Keep onions moving so they brown evenly
- Sauce both the bun and the onions lightly
Recipe variations
Easy swaps let you customize this smash burger to match any craving or diet.
- Add sliced jalapeños for a spicy kick
- Use turkey or plant-based beef instead
- Swap American cheese for pepper jack
- Cook the patties in a cast-iron skillet
What to serve with this recipe
Round out the meal with classic sides that complement the rich, savory burger.
- Crispy french fries or sweet potato fries
- Creamy coleslaw for cool contrast
- Simple green salad with vinaigrette
- Ice-cold lemonade or craft beer
Pairs well with this: Easy Folded Egg Sandwich with Ham and Cheese
Frequently asked questions
Here are answers to the questions people ask most about smash burgers.
Can I make the sauce ahead of time?
Yes, the special sauce keeps well in the fridge for up to five days. Stir it before using so the flavors stay blended and fresh.
What is the best beef for smash burgers?
Choose 80/20 ground beef for ideal juiciness and browning. Leaner mixes dry out too quickly under high heat and pressure.
How do I get a good crust on the patties?
Use a screaming-hot griddle and press firmly with parchment. Leave the patties untouched until they release easily on their own.
Can I caramelize the onions without mayonnaise?
Absolutely. A little oil or butter works fine, though mayonnaise adds extra richness and helps the onions brown more evenly.
Final thoughts
This smash burger with caramelized onions and special sauce is pure comfort food done right. The combination of crispy edges, melty cheese, sweet onions, and creamy sauce is hard to beat. Make a batch for friends or just treat yourself on a weeknight. Let me know how yours turned out in the comments and give the recipe a rating if you loved it.