This mushroom swiss patty melt layers a seasoned beef patty with caramelized onions, tender mushrooms, and melted Swiss cheese between two slices of golden, buttery toast. It is a diner classic that comes together in one skillet in about an hour or less.
The trick is cooking the onions and mushrooms first, then using the same pan for the patties and the sandwiches so every layer picks up flavor. Here is how to do it, plus fixes for soggy bread and tips for storing leftovers.
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Why This Mushroom Swiss Patty Melt Recipe Works
A patty melt is different from a cheeseburger because the patty is shaped to fit sliced bread and the whole sandwich is griddled, which gives crisp, buttery edges. The beef stays juicy because it is cooked just until done and then tucked between melting cheese.
Slowly cooking the onions until golden gives them a deep sweetness, and the mushrooms are cooked until their liquid evaporates, which concentrates the flavor instead of leaving the bread wet. A splash of Worcestershire adds savory depth.
Using two slices of Swiss, one under the patty and one above the vegetables, glues the sandwich together so it slices cleanly and does not slide apart.
Ingredients for Mushroom Swiss Patty Melt
- 1 pound ground beef (80 to 85 percent lean)
- Salt and freshly ground black pepper
- 1/2 teaspoon garlic powder
- 1 small onion, thinly sliced
- 8 ounces mushrooms, sliced
- 2 tablespoons unsalted butter
- 1 tablespoon neutral oil
- 1 tablespoon Worcestershire sauce (optional)
- 8 slices Swiss cheese
- 8 slices thick sandwich bread (rye works well)
- About 3 tablespoons softened butter, for the bread
Ground beef: choose a blend with some fat so the patties stay juicy. Very lean beef turns dry in a thin patty.
Mushrooms: cremini give the most flavor, and white button mushrooms work too. Cook them in a single layer so they brown rather than steam.
Swiss cheese: it melts smoothly and has a mild, nutty flavor. Gruyere or provolone can stand in.
Thick bread: it holds up to the filling and toasts evenly. Thin bread tends to tear.
How to Make Mushroom Swiss Patty Melt
1. Caramelize the onions. Heat the butter and oil in a large skillet over medium heat. Cook the onion for 6 to 8 minutes, stirring now and then, until soft and golden.
2. Cook the mushrooms. Add the mushrooms with a pinch of salt and pepper and the Worcestershire. Cook for 6 to 8 minutes until the liquid is gone and they are browned. Move everything to a plate.
3. Shape the patties. Season the beef with salt, pepper, and garlic powder, then form four oval patties about the size of the bread. Make them slightly thin, since they shrink.
4. Cook the patties. Cook in the same skillet over medium high heat for about 4 minutes per side, until browned and 160 degrees F inside. Set aside.
5. Butter the bread. Spread softened butter on one side of each slice.
6. Build. Lay four slices butter side down in the skillet over medium heat. Top each with a slice of Swiss, a patty, a spoonful of onions and mushrooms, another slice of Swiss, and a second slice of bread, butter side up.
7. Griddle. Cook 3 to 4 minutes until deeply golden, flip carefully, and cook the other side until the cheese melts. Rest for a minute, then slice in half.
How to Serve Mushroom Swiss Patty Melt
Serve hot, cut on the diagonal, with something crisp and something cool. A pickle spear and a simple salad cut through the richness.
Classic sides include homemade potato fries and a creamy creamy coleslaw. For a diner style lunch, pair half a sandwich with grilled cheese and creamy tomato soup, or add a plain cheeseburger for guests who want a simpler option.
How to Store and Reheat Mushroom Swiss Patty Melt
Refrigerate leftovers within two hours in an airtight container, and eat within 3 to 4 days. For the ideal texture, store the patties and the onion mushroom mixture separately from the bread.
Reheat a whole sandwich in a skillet over low heat with a lid, flipping once, until it reaches 165 degrees F. A toaster oven also crisps it back up. Avoid the microwave for the whole sandwich, since it softens the bread.
Tips and Variations for Mushroom Swiss Patty Melt
- Do not rush the onions. Medium heat and patience give sweet, golden onions instead of bitter ones.
- Dry the mushrooms. Letting their liquid cook off prevents soggy bread.
- Use butter on the bread. It browns more evenly than oil and tastes better.
- Press lightly. A gentle press with a spatula improves contact without squeezing out juices.
- Add a sauce. A little mayonnaise mixed with mustard is great spread on the bread.
- Try other breads. Marbled rye gives a classic deli taste, and sourdough adds tang.
- Cook beef safely. The FDA recommends cooking ground beef to 160 degrees F; see its safe minimum temperature chart.
Frequently Asked Questions About Mushroom Swiss Patty Melt
What is the difference between a patty melt and a burger?
A patty melt is served on griddled sliced bread, usually rye, with melted cheese and cooked onions, while a burger uses a bun.
What bread is ideal for a mushroom swiss patty melt?
Rye is traditional, but thick white bread, sourdough, or marbled rye all work. Choose slices that are sturdy enough to hold the filling.
Can I make mushroom swiss patty melt with turkey?
Yes. Use ground turkey with a little extra oil in the pan and cook the patties to 165 degrees F.
How do I keep the patty melt from getting soggy?
Cook the mushrooms until dry, keep the patties from steaming, and layer cheese against the bread as a barrier.
Can I prepare the mushroom swiss patty melt ahead?
You can cook the onions, mushrooms, and patties a day ahead, then assemble and griddle just before serving.
Mushroom Swiss Patty Melt
Equipment
- Large skillet
- Spatula
Ingredients
Main Ingredients
- 1 lb ground beef 80 to 85 percent lean
- ¼ tsp salt and black pepper to taste
- ½ tsp garlic powder
- 1 small onion thinly sliced
- 8 oz mushrooms sliced
- 2 tbsp unsalted butter
- 1 tbsp neutral oil
- 1 tbsp Worcestershire sauce optional
- 8 slices Swiss cheese
- 8 slices thick sandwich bread rye works well
- 3 tbsp softened butter for the bread
Instructions
Cooking
- Caramelize the onions. Cook the onion in the butter and oil over medium heat for 6 to 8 minutes until golden.
- Brown the mushrooms. Add the mushrooms, salt, pepper, and Worcestershire and cook 6 to 8 minutes until dry. Set aside.
- Shape and cook the patties. Season the beef, form four ovals, and cook 4 minutes per side until 160 degrees F.
- Build. Butter the bread. Layer Swiss, patty, onions and mushrooms, and more Swiss between slices, butter side out.
- Griddle. Cook 3 to 4 minutes per side over medium heat until golden and the cheese melts.
