recipeincaption adapted by JojoM

Juicy smash patties layered with cheddar, caramelized onions, crispy bacon, and homemade smoky baconnaise on brioche buns. The ultimate burger indulgence.
If you love a good bacon smashburger with lacy, crispy edges and melty cheese, this one goes nuclear. We layer juicy smash patties, caramelized onions, crispy bacon, and a homemade baconnaise that’s smoky, garlicky, and tangy—all tucked into buttery brioche buns. It’s a cheddar bacon burger that eats like a steakhouse classic but cooks fast on a hot skillet. 🤤
TL;DR: caramelize onions low and slow, smash hard for crust, and let the baconnaise do the heavy lifting. That’s your ultimate smash burger recipe.
SEO bonus mentions for your readers: brioche bun smashburger, caramelized onion burger, homemade baconnaise. 😉
Think mayo, but meat-lover’s edition. The egg and mustard help it emulsify; bacon fat brings smoky depth; a splash of vinegar + lemon cuts through the richness. Fold in crispy diced bacon so every smear has pops of salty crunch. Make it first and chill 30 minutes so it thickens and spreads like a dream. 🥄
Flavor dial-ins:
Butter + olive oil, medium-low heat, and patience. Stir occasionally until golden and jammy (30–40 mins). Finish with balsamic reduction for glossy, sweet-savory onions that balance the bacon and beef. 🧅
In a tall jar: egg, garlic, Dijon, vinegar, lemon, salt & pepper. Pour in bacon fat and neutral oil. Immersion blend at the bottom, then slowly lift to emulsify. Fold in diced bacon. Chill. (Hello, sandwich spread of your dreams. 😍)
Season beef, divide into 4 balls. On a ripping-hot skillet lightly filmed with oil, press hard with a spatula (use parchment if needed) to create max contact. Cook 2–3 minutes, flip, top with cheddar, cover briefly to melt.
Toast brioche, slather baconnaise on both sides, then stack: patty → onions → bacon → second patty. More baconnaise? Always. Serve immediately while the edges are still shattery-crisp.
Smoky bacon fat amplifies savory notes in the beef, acidity (vinegar + lemon) keeps bites bright, and brioche adds buttery sweetness. Caramelized onions bridge sweet and umami, while sharp cheddar locks in salty richness. Every component is deliberate—together, they make the best bacon smashburger you’ll cook at home. 💥
Juicy smash patties layered with cheddar, caramelized onions, crispy bacon, and homemade smoky baconnaise on brioche buns. The ultimate burger indulgence.

Chill the baconnaise for at least 30 minutes to thicken before using.
Use a cast iron skillet for maximum crust on the smash patties.
Caramelize onions low and slow—don’t rush this step for best flavor.
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Bake bacon at 200°C/400°F for 15–20 minutes until crispy. Save bacon fat for baconnaise.
Cook sliced onions in butter and olive oil over low heat for 30–40 minutes until golden. Stir occasionally.
Finish onions with balsamic reduction before removing from heat.
In a tall jar, combine egg, garlic, vinegar, lemon juice, mustard, salt, and pepper.
Pour in bacon fat and oil. Blend with an immersion blender at the bottom for 10 seconds until emulsified.
Slowly raise blender to incorporate everything. Stir in diced bacon. Chill in fridge.
Season ground beef with salt and pepper, divide into 4 balls.
Heat skillet with neutral oil. Place beef balls and smash flat.
Cook 2–3 minutes until crust forms, flip, then top with cheddar. Cover and melt for 1–2 minutes.
Toast brioche buns.
Spread baconnaise generously on buns.
Stack patties, crispy bacon strips, and caramelized onions.
Serve hot and enjoy.
8/13/2025
I need this in my life 😋
5/20/2025
So good 🤤 I’m making this tonight.
3/28/2025
Need a full step-by-step video for this one!
3/26/2025
Phew 🔥 this is a next-level burger!
3/26/2025
That looks soooo good 😩😩
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Serving Size: 1 burger
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
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Jalalsamfit (adapted by JojoM)