I made a Mushroom Skillet that melts into ooey-gooey cheese so French onion soup would be jealous, and I’m not kidding when I say you have to keep scrolling to see it.

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I’m obsessed with this Cheesy Mushroom Skillet because it tastes like French onion soup but better for lazy weeknights. I love the way the caramelized onions and earthy mushrooms hit, and the melty Gruyere cheese makes everything stretch and sing.

I always imagine a plate of Cheesy Mushrooms piled on toast, cheese pulling like it owed me money. But it’s not fussy.

It’s loud, savory, and kind of sinful. I don’t care if anyone calls it a God Mat of veggie dishes.

I just want another bite. Now.

Immediately. I’ll eat it straight from the skillet, no shame right now.

Ingredients

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Caramelizes into sweet jammy base.
Adds meaty, earthy bite.
Basically, it’s rich and silky.
Helps brown things, lighter fat.
A pinch speeds caramelization, it’s sweet.
Bright garlic punch, it’s not shy.
Thickens so broth clings to bread.
Wine adds tangy, slightly boozy notes.
Basically, beef broth’s the savory depth.
Worcestershire brings an extra umami kick.
Thyme gives tiny woodsy herb notes.
Bay leaf adds subtle herbal warmth.
Salt pulls flavors together, season carefully.
Pepper adds fresh bite and lift.
Plus, it’s for scooping and crunch.
Gruyere melts into gooey, nutty strings.
Parmesan adds sharp, salty finish.
Parsley brightens it, optional freshness.

Ingredient Quantities

3 large yellow onions, thinly sliced

12 ounces cremini or button mushrooms, sliced

3 tablespoons unsalted butter

1 tablespoon olive oil

1 teaspoon granulated sugar

2 cloves garlic, minced

2 tablespoons all purpose flour

1/2 cup dry white wine or dry sherry

4 cups beef broth (use low sodium if possible)

1 tablespoon Worcestershire sauce

2 sprigs fresh thyme or 1 teaspoon dried thyme

1 bay leaf

1 teaspoon kosher salt, plus more to taste

1/2 teaspoon freshly ground black pepper

1 small baguette or 8 to 10 slices crusty bread, for toasting

8 ounces Gruyere cheese, grated (or Swiss if you cant find Gruyere)

1/4 cup grated Parmesan cheese

Fresh parsley for garnish, optional

How to Make this

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1. Heat a large oven safe skillet over medium heat, add butter and olive oil until butter melts and foams, then add the thinly sliced onions and a teaspoon sugar; cook, stirring every few minutes, until deep golden brown and caramelized, about 30 to 40 minutes — be patient, this is where the flavor is.

2. When onions are about 10 minutes from done, add sliced mushrooms and raise heat to medium-high; cook until mushrooms release their liquid and it evaporates, about 8 to 10 minutes, then stir in the minced garlic for 1 minute.

3. Sprinkle the flour over the onion and mushroom mix and cook, stirring, for 1 to 2 minutes to get rid of the raw flour taste.

4. Pour in the dry white wine or sherry to deglaze the pan, scraping up any browned bits from the bottom; let it bubble and reduce by about half, about 2 to 3 minutes.

5. Stir in the beef broth, Worcestershire sauce, thyme sprigs and bay leaf; bring to a simmer, reduce heat and simmer gently for 15 to 20 minutes so the flavors meld and the broth slightly thickens. Season with 1 teaspoon kosher salt and 1/2 teaspoon black pepper, taste and adjust.

6. While soup simmers, preheat your broiler on high and arrange a rack 6 inches from the heat. Slice the baguette and brush lightly with olive oil or butter, then toast on a baking sheet or in a skillet until crisp and golden, about 5 minutes.

7. Remove thyme sprigs and bay leaf from the skillet. Taste again and add more salt or pepper if needed. If you want a silkier texture, stir in a little extra butter at this point.

8. Ladle or spoon the hot mushroom onion soup back into the oven safe skillet so the surface is even, or keep it in the same skillet if you never moved it. Place the toasted bread slices on top of the soup, cover each slice generously with grated Gruyere and a sprinkle of Parmesan.

9. Put the skillet under the broiler until the cheese is melted, bubbly and browned in spots, about 2 to 4 minutes; watch it carefully so it does not burn.

10. Remove from oven, let rest a minute, garnish with chopped fresh parsley if you like and serve straight from the skillet. Enjoy the cheesy, savory mushroom goodness that tastes just like French onion soup.

Equipment Needed

1. Large oven-safe skillet (you’ll cook and broil in it, so make sure it can go in the oven)
2. Wooden spoon or heatproof spatula for stirring and scraping up browned bits
3. Chef’s knife (for slicing onions, mushrooms and chopping parsley)
4. Cutting board
5. Measuring cups and spoons
6. Box grater for the Gruyere and Parmesan (or a hand grater)
7. Baking sheet or sheet pan for toasting the baguette slices
8. Ladle or large spoon for portioning soup into the skillet and onto bowls
9. Oven mitts or potholders and a timer to keep an eye on the broiler so the cheese doesn’t burn

FAQ

Can I make this vegetarian or vegan?

For vegetarian, swap the beef broth for a rich vegetable broth and use Worcestershire labeled vegetarian, the flavor will be very close. For vegan, use vegan butter or olive oil, plant based cheese or skip it, and a hearty mushroom broth or kombu seaweed added to veggie broth helps give that meaty depth.

My onions are not caramelizing, what am I doing wrong?

If they are just steaming, your pan is too crowded or heat is too low. Use a large skillet, medium to medium high heat, and stir every few minutes. The sugar helps, but patience is the key, it can take 25 to 35 minutes to get deep brown, sweet onions.

Can I use white wine or should I skip alcohol?

Dry white wine or dry sherry adds great depth, but you can skip it. Replace with an equal amount of extra broth and a splash of apple cider vinegar or lemon juice to brighten flavors if you want the acidity.

How do I get the cheese to melt nicely on the toast without burning the bread?

Toast the baguette slices first until golden, then top with grated Gruyere and a little Parmesan and broil just until bubbling and golden. Watch closely, it goes fast. If you dont have a broiler, bake at 450 F for 4 to 6 minutes.

Can I make this ahead and reheat it?

Yes, make the soup base up to 3 days ahead and chill. Reheat gently on the stove, add a splash of broth if it got thick. For serving, assemble and broil the toasts just before eating so they stay crisp.

Any tips for a richer, more French onion like flavor?

Use a mix of onions if you like, but definitely caramelize low and slow, add a splash of balsamic near the end for extra sweetness and depth, and use a good beef broth. Fresh thyme instead of dried gives a brighter herbal note.

Cheesy Mushroom Skillet Tastes Just Like French Onion Soup Recipe Substitutions and Variations

Onions
- Shallots — milder, sweeter, use about 1 1/2 times the amount
- Sweet onions (Vidalia or Walla Walla) — sweeter and juicier, same amount
- Red onion — a bit sharper, cooks down nicely, same amount
Mushrooms
- Portobello — meatier texture, slice thicker and sauté a bit longer
- Shiitake — deeper umami, remove stems and use same volume
- Mixed wild mushrooms — more complex flavor, use same total weight
Dry white wine or dry sherry
- Extra 1/2 cup beef broth plus 1 tablespoon white wine vinegar — gives acidity without alcohol
- Dry vermouth — similar flavor profile, use same amount
- Apple cider vinegar diluted with water (1 part vinegar to 3 parts water) — a quick swap, use about 1/4 cup
Gruyere cheese
- Swiss cheese — very similar melting and taste, use same amount
- Fontina — creamier melt, slightly milder, same quantity
- Sharp white cheddar mixed half and half with a milder cheese — for a tangier finish if Gruyere not available

Pro Tips

1) Be patient with the onions. Don’t rush the caramelizing by turning the heat up too high. Low and steady for 30 to 40 minutes gives that deep sweet flavor. If they start to stick, add a tablespoon or two of water to loosen the fond, scrape the pan, then keep cooking.

2) Cook mushrooms separately until their liquid evaporates. If you add them too early they make the whole pot watery. Give them a good sear on higher heat so they brown, then fold them into the onions.

3) Toast the bread and melt the cheese right before serving. Toast the slices until very crisp so they don’t go soggy right away. When broiling the cheese, stand there and watch it, it goes from perfect to burned in seconds. If you want extra silkiness, stir in a knob of butter off heat just before ladling.

4) Taste and adjust like a pro. Use low sodium beef broth so you can control salt. Add Worcestershire and a splash more wine or a pinch of sugar if it needs brightness, and don’t be afraid to finish with a little acid (a few drops of sherry vinegar or lemon) to lift the whole bowl.

Cheesy Mushroom Skillet Tastes Just Like French Onion Soup Recipe

Recipe by Bob Jones

0.0 from 0 votes

I made a Mushroom Skillet that melts into ooey-gooey cheese so French onion soup would be jealous, and I'm not kidding when I say you have to keep scrolling to see it.

Servings

servings

Calories

417

kcal

Equipment: 1. Large oven-safe skillet (you’ll cook and broil in it, so make sure it can go in the oven)
2. Wooden spoon or heatproof spatula for stirring and scraping up browned bits
3. Chef’s knife (for slicing onions, mushrooms and chopping parsley)
4. Cutting board
5. Measuring cups and spoons
6. Box grater for the Gruyere and Parmesan (or a hand grater)
7. Baking sheet or sheet pan for toasting the baguette slices
8. Ladle or large spoon for portioning soup into the skillet and onto bowls
9. Oven mitts or potholders and a timer to keep an eye on the broiler so the cheese doesn’t burn

Ingredients

3 large yellow onions, thinly sliced
12 ounces cremini or button mushrooms, sliced
3 tablespoons unsalted butter
1 tablespoon olive oil
1 teaspoon granulated sugar
2 cloves garlic, minced
2 tablespoons all purpose flour
1/2 cup dry white wine or dry sherry
4 cups beef broth (use low sodium if possible)
1 tablespoon Worcestershire sauce
2 sprigs fresh thyme or 1 teaspoon dried thyme
1 bay leaf
1 teaspoon kosher salt, plus more to taste
1/2 teaspoon freshly ground black pepper
1 small baguette or 8 to 10 slices crusty bread, for toasting
8 ounces Gruyere cheese, grated (or Swiss if you cant find Gruyere)
1/4 cup grated Parmesan cheese
Fresh parsley for garnish, optional

Directions

Heat a large oven safe skillet over medium heat, add butter and olive oil until butter melts and foams, then add the thinly sliced onions and a teaspoon sugar; cook, stirring every few minutes, until deep golden brown and caramelized, about 30 to 40 minutes — be patient, this is where the flavor is.
When onions are about 10 minutes from done, add sliced mushrooms and raise heat to medium-high; cook until mushrooms release their liquid and it evaporates, about 8 to 10 minutes, then stir in the minced garlic for 1 minute.
Sprinkle the flour over the onion and mushroom mix and cook, stirring, for 1 to 2 minutes to get rid of the raw flour taste.
Pour in the dry white wine or sherry to deglaze the pan, scraping up any browned bits from the bottom; let it bubble and reduce by about half, about 2 to 3 minutes.
Stir in the beef broth, Worcestershire sauce, thyme sprigs and bay leaf; bring to a simmer, reduce heat and simmer gently for 15 to 20 minutes so the flavors meld and the broth slightly thickens. Season with 1 teaspoon kosher salt and 1/2 teaspoon black pepper, taste and adjust.
While soup simmers, preheat your broiler on high and arrange a rack 6 inches from the heat. Slice the baguette and brush lightly with olive oil or butter, then toast on a baking sheet or in a skillet until crisp and golden, about 5 minutes.
Remove thyme sprigs and bay leaf from the skillet. Taste again and add more salt or pepper if needed. If you want a silkier texture, stir in a little extra butter at this point.
Ladle or spoon the hot mushroom onion soup back into the oven safe skillet so the surface is even, or keep it in the same skillet if you never moved it. Place the toasted bread slices on top of the soup, cover each slice generously with grated Gruyere and a sprinkle of Parmesan.
Put the skillet under the broiler until the cheese is melted, bubbly and browned in spots, about 2 to 4 minutes; watch it carefully so it does not burn.
Remove from oven, let rest a minute, garnish with chopped fresh parsley if you like and serve straight from the skillet. Enjoy the cheesy, savory mushroom goodness that tastes just like French onion soup.

Notes

Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.