These smashing patty melts pack a juicy seasoned beef patty, a heap of slow caramelized onions, and melted Swiss cheese between two slices of buttery griddled rye, for a diner classic that is easy to make at home.
The patty melt is the ideal of a burger and a grilled cheese in one sandwich, and the secret behind the confidential sauce style flavor is simple: ketchup and Worcestershire mixed right into the beef, plus onions cooked low and slow until sweet and jammy.
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Why These Smashing Patty Melts Recipe Works
Cooking the onions slowly in olive oil takes about 25 minutes, but it turns them golden, soft, and sweet, which is the heart of the sandwich. Mixing ketchup, Worcestershire, and onion powder into the beef seasons it all the way through, so you do not need a separate sauce.
Shaping the patties slightly wider than the bread means the beef shrinks to fit perfectly. Griddling the finished sandwich in butter gives the rye a crisp, golden crust while the Swiss melts into every layer.
Ingredients for Smashing Patty Melts
- 1 tbsp olive oil
- 2 cups thinly sliced onions (about 2 large)
- 1 1/2 lb lean ground beef
- 1 tbsp ketchup
- 1 tsp Worcestershire sauce
- 1/2 tsp onion powder
- 1/2 tsp kosher salt, plus a pinch for the onions
- Freshly ground black pepper, to taste
- 6 tbsp unsalted butter, divided
- 8 slices rye bread
- 8 oz Swiss cheese, sliced (about 8 slices)
Ground beef. Lean beef works well here because the butter adds richness. Keep the mixing gentle for tender patties.
Onions. Yellow onions caramelize ideal. Slice them thin and evenly so they cook at the same pace.
Rye bread. Seeded or plain rye both work, and sourdough is a fine swap. Choose slices that are sturdy enough to hold the filling.
Swiss cheese. Its mild, nutty flavor pairs with rye and melts smoothly. Gruyere makes it a bit richer.
Worcestershire and ketchup. They add a savory, tangy edge that stands in for the secret sauce.
How to Make Smashing Patty Melts
1. Caramelize the onions. Heat the olive oil in a skillet over medium low heat, add the onions and a pinch of salt, and cook for 20 to 25 minutes, stirring often, until golden and soft. Set them aside.
2. Season the beef. Gently mix the beef with the ketchup, Worcestershire, onion powder, salt, and pepper until just combined.
3. Shape. Form four oval patties a little larger than your bread slices and press them fairly thin.
4. Cook the patties. Melt 2 tbsp of butter in a cast iron skillet over medium heat. Cook the patties for 4 to 5 minutes per side, until browned and cooked through to 160 degrees F, pressing gently with a spatula. Move them to a plate.
5. Reset the pan. Wipe the skillet clean and melt a little of the remaining butter over medium heat.
6. Assemble. Lay out four slices of rye. Top each with a patty, a generous scoop of onions, and 2 slices of Swiss, then cover with the remaining bread.
7. Griddle. Butter the outside of the sandwiches as needed and cook them in the skillet over medium heat for 2 to 4 minutes per side, pressing lightly, until the bread is crisp and golden and the cheese is fully melted.
How to Serve Smashing Patty Melts
Slice each sandwich in half so the cheese stretches, and serve it hot with dill pickles or a crisp green salad. A pile of double fried potato fries turns it into a diner plate, and a creamy scoop of dill pickle potato salad adds a cool bite.
For more griddled beef recipes, look at the Flat top burgers or the classic homemade hamburgers.
How to Store and Reheat Smashing Patty Melts
Cool the sandwiches and refrigerate them within two hours of cooking. Wrapped tightly, they keep for 3 to 4 days.
Reheat in a skillet over medium low heat, covered, for several minutes per side until crisp and heated through to 165 degrees F. The oven works for a larger batch, but avoid the microwave since it softens the rye.
Tips and Variations for Smashing Patty Melts
Do not rush the onions. Low heat is what makes them sweet instead of bitter.
Make the patties wide and thin. They shrink as they cook, and a thin patty cooks quickly without drying out.
Butter the bread evenly. A thin layer all the way to the edges gives a crisp, uniform crust.
Use a lid. Covering the skillet for a minute helps the cheese melt fully.
Add a dipping sauce. A mix of mayonnaise, ketchup, and pickle relish makes a quick burger sauce if you want one.
Check the temperature. Ground beef should reach 160 degrees F, as listed in the FDA safe minimum temperature chart.
Try other cheeses. Provolone or American melt well in place of Swiss.
Add mushrooms. Sauteed mushrooms can cook alongside the onions for extra flavor.
Frequently Asked Questions About Smashing Patty Melts
What is the difference between a patty melt and a burger?
A patty melt is served on griddled rye bread with caramelized onions and melted cheese, while a burger uses a bun and usually cold toppings.
Can I make smashing patty melts ahead of time?
Cook the onions and shape the patties a day ahead. Griddle the sandwiches just before serving so the bread stays crisp.
What is the confidential sauce flavor?
It comes from the ketchup and Worcestershire in the beef plus the sweet onions, which together give a tangy, savory burger sauce taste without a separate sauce.
What bread works well for smashing patty melts?
Rye is traditional, but sourdough or thick sliced Texas toast also holds the filling and crisps up well.
Can I use less butter?
Yes. Use just enough to coat the pan lightly, though the bread will brown less richly.
Smashing Patty Melts Confidential Sauce
Equipment
- Large skillet
- Cast iron skillet
- Spatula
Ingredients
Main Ingredients
- 1 tbsp olive oil
- 2 cup thinly sliced onions about 2 large
- 1 ½ lb lean ground beef
- 1 tbsp ketchup
- 1 tsp Worcestershire sauce
- ½ tsp onion powder
- ½ tsp kosher salt plus a pinch for the onions
- ¼ tsp black pepper to taste
- 6 tbsp unsalted butter divided
- 8 slices rye bread
- 8 oz Swiss cheese sliced, about 8 slices
Instructions
Cooking
- Caramelize. Cook the onions in the oil in a large skillet over medium low heat 20 to 25 minutes until golden and soft.
- Mix and shape. Combine the beef with the ketchup, Worcestershire, onion powder, salt, and pepper, then shape 4 oval patties a bit larger than the bread.
- Cook the patties. Brown them in 2 tablespoons butter in a cast iron skillet 4 to 5 minutes per side to 160 degrees F, pressing gently with a spatula.
- Build. Layer patty, onions, and 2 slices of Swiss between 2 slices of rye.
- Griddle. Cook the sandwiches in the remaining butter over medium heat 2 to 4 minutes per side until crisp and the cheese melts.
