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Gourmet Smash Burgers with Caramelized Onions & Garlic Aioli

Gourmet Smash Burgers with Caramelized Onions & Garlic Aioli

When you want to kick off the weekend with something indulgent yet chef-crafted, these Gourmet Smash Burgers with Caramelized Onions and Garlic Aioli are the answer. The patties sear into crispy-edged perfection, layered with melty cheese, sweet onions, and a garlicky aioli that ties everything together. This is a classic elevated—the kind of burger that belongs both on your grill and your Instagram feed.

Ingredients

For the Burgers: 1 ½ lb ground beef (80/20 blend for best flavor)

1 tsp kosher salt

½ tsp black pepper

4 brioche buns, buttered and toasted

4 slices cheddar or Swiss cheese

For the Caramelized Onions: 2 large yellow onions, thinly sliced

1 tbsp olive oil

1 tbsp butter

½ tsp salt

1 tsp brown sugar (optional, for deeper sweetness)

For the Garlic Aioli: ½ cup mayonnaise

2 garlic cloves, finely minced

1 tsp lemon juice

1 tsp Dijon mustard

Pinch of salt and black pepper

Optional Toppings: 
Lettuce, Tomato, Pickles, Crispy onions, Bacon strips

Instructions

1
Caramelize the Onions: 
In a large skillet, heat olive oil and butter over medium-low heat. Add onions and salt. Cook slowly, stirring often, until soft and golden (about 25 minutes). Add brown sugar in the last 5 minutes for extra sweetness. Set aside.
2
Make the Garlic Aioli:
 In a small bowl, whisk together mayonnaise, garlic, lemon juice, Dijon, salt, and pepper. Chill until serving.
3
Form and Smash the Patties:
 Divide beef into 4-6 balls (about 6 oz each). Heat a griddle or cast-iron skillet over medium-high until very hot. Place beef balls on the surface and immediately smash flat with a metal spatula. Sprinkle with salt and pepper.
4
Sear and Melt: 
Cook 2–3 minutes until edges are crisp, flip, top with cheese, and cook another minute until melted.
5
5. Assemble:
 Spread garlic aioli on toasted buns. Layer with lettuce, tomato, burger patty, caramelized onions, and any extras. Top with the other bun and serve hot.
6
I like to thaw, proof and bake fresh Rhodes Texas Rolls for fresh buns for my burgers! It's worth the effort!

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