Description

This French Onion Steak Sandwich with Grilled Mushrooms is a savory and hearty main course featuring tender thinly sliced steak, caramelized onions, and sautéed mushrooms, topped with melted provolone or Swiss cheese on toasted hoagie rolls. Perfectly balanced with rich flavors and a melt-in-your-mouth texture, it offers a satisfying meal that’s easy to prepare on the stovetop.

Ingredients

Scale

Steak and Mushroom Mixture

1 pound thinly sliced steak (such as ribeye or sirloin)
2 tablespoons olive oil
2 tablespoons butter
8 oz mushrooms, sliced
1 teaspoon Worcestershire sauce
Salt and pepper to taste

Caramelized Onions

2 large yellow onions, thinly sliced
1 teaspoon sugar

Assembly

4 slices provolone or Swiss cheese
4 hoagie rolls or crusty sandwich buns, toasted
Fresh thyme or parsley for garnish (optional)

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Instructions

Caramelize the Onions: In a large skillet over medium heat, melt the butter with 1 tablespoon of olive oil. Add the thinly sliced onions and cook slowly, stirring occasionally, for 20 to 25 minutes until they are golden and caramelized. Halfway through cooking, sprinkle sugar over the onions to enhance caramelization. Once done, remove the onions from the skillet and set them aside.
Sauté the Mushrooms: Using the same skillet, add the remaining tablespoon of olive oil and the sliced mushrooms. Sauté for 6 to 8 minutes until the mushrooms are browned and tender. Season them with salt, pepper, and Worcestershire sauce. Remove the mushrooms from the skillet and keep them warm.
Sear the Steak: Increase the heat to medium-high. Add the thinly sliced steak in batches to avoid overcrowding the skillet. Sear each batch for 1 to 2 minutes per side, seasoning lightly with salt and pepper, until cooked through but still tender. After all steak batches are cooked, return the steak, onions, and mushrooms to the skillet and stir to combine all ingredients evenly.
Assemble and Melt Cheese: Divide the steak, onion, and mushroom mixture evenly among the toasted hoagie rolls. Top each sandwich with a slice of provolone or Swiss cheese. Place the assembled sandwiches under a broiler for 1 to 2 minutes, or until the cheese is melted and bubbly.
Garnish and Serve: Garnish the sandwiches with fresh thyme or parsley if desired. Serve the sandwiches warm for the best flavor and texture.

Notes

To save time, caramelize the onions in advance and store them in the fridge for up to 3 days.
You can use a grill or griddle instead of a skillet to cook the steak and mushrooms for an extra smoky flavor.
Ensure not to overcrowd the skillet when searing steak to achieve a good sear.
Use fresh herbs for garnish to add a bright, fresh flavor contrast.

Prep Time: 15 minutes
Cook Time: 30 minutes
Category: Main Course
Method: Stovetop
Cuisine: American