Name: Low-Carb Sourdough Smash Patty Melt
Prep time: 30 min
Total time: 30 min
Yield: 2 servings
Ingredients: 1 lb 85/15 ground beef; 1/2 medium yellow onion, thinly sliced; 4 slices low-carb sourdough-style bread (such as Carbonaut or homemade, 40g/slice); 4 slices sharp cheddar cheese (or high-protein cheese); 1 tbsp mayonnaise; 1 tbsp unsalted butter; 1 tsp Worcestershire sauce; 1/2 tsp garlic powder; Kosher salt and black pepper to taste; Cooking spray or neutral oil

Low-Carb Sourdough Smash Patty Melt

HerbyThyme8328

This Low-Carb Sourdough Smash Patty Melt merges the juicy, crispy-edge magic of a smash burger with the melty, savory comfort of a patty melt—while keeping carbs in check. We use high-protein, low-carb sourdough-style bread, sharp cheddar, and double-smashed beef patties for protein-packed satisfaction. Slow-caramelized onions and a hint of Worcestershire deliver deep, classic flavors, while a mayo-brushed crust gives golden crunch. This sandwich hits all the right notes: meaty, cheesy, oniony, and almost guilt-free. Perfect for a cool California night when you want comfort food without the carb crash!

Ingredients

Instructions

Heat a large skillet or cast iron pan over medium-high heat. Add butter and onions with a pinch of salt. Cook, stirring frequently, until golden and caramelized, about 8-10 minutes. Deglaze with Worcestershire sauce and remove onions from pan.
Shape ground beef into four loosely packed 2.5 oz balls. Season with salt, pepper, and garlic powder. Increase skillet heat to high. Add a little oil or cooking spray, then place beef balls in pan. Smash each ball flat with a sturdy spatula. Sear 2-3 minutes until edges are crispy and browned, then flip.
Top each patty with a slice of cheese. Cover pan for 30 seconds to melt the cheese. Remove patties to a plate.
Spread a thin layer of mayonnaise on one side of each bread slice. Wipe out the pan and return to medium heat. Place bread mayo-side-down and toast until golden, about 1-2 minutes.
Assemble patty melts: On two slices of toasted bread (untoasted side up), layer half the caramelized onions, two smash patties with cheese each, then top with remaining onions and bread. Press gently.
Return assembled melts to pan. Cook 1-2 minutes per side, pressing lightly, until bread is crisp and cheese is gooey. Slice in half and serve hot.