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Caramelized Onion & Mushroom Swiss Panini

If you are looking for a quick hot  lunch or a comforting sandwich to pair with dinner, this panini, packed with baby bella mushrooms, gooey swiss cheese, and sweet sauteed onions is a fantastic choice.

 I needed to make something fairly quick for lunch and since I still have 97 things left to check off my to-do list for the day, this worked out perfect.

mushroom onion swiss panini vertical

This panini sandwich could easily be made vegan if you just omit the cheese.   This is what it looks like before adding the swiss.  Still looks yummy but I love my cheese…

Mushroom Swiss Panini Sandwich

It took 20 minutes to make from start to finish and 2 minutes to eat..  While the onions & mushrooms were cooking, I started prepping the sandwiches and heating the panini press.

Mushroom panini stacked

I sautéed the mushrooms & onions separately and then added them back to the pan to heat together at the end.

mushrooms and onions

up-close & personal.. Panini’s are “pressed” sandwiches that can be filled with anything you’d like.  This vegetarian version will satisfy even the biggest of meat-eaters..

Mushroom panini stack upclose

I LOVE Ciabatta bread for Panini’s.  The outside gets crunchy while the inside stays soft.  It is the perfect bread choice for any “pressed” sandwich.

Caramelized Onion & Mushroom Swiss Panini


  • 4 tbsp extra virgin olive oil (divided)
  • 1 large sweet onion, thinly sliced
  • pinch salt
  • 1 tsp sugar
  • 6 oz baby bella mushrooms, sliced
  • 2 green onions or scallions
  • 3 ciabatta rolls, halved
  • 3 tbsp of dijon mustard
  • 6 slices Swiss cheese


  1. Place 2 tablespoons olive oil into a sauté pan over medium-low heat. Add onions. Season with salt and add sugar. Continue cooking, stirring as necessary until onions have caramelized (appx. 15 min) Set aside.
  2. Add the remaining 2 tablespoons olive oil to another pan over medium heat. Add mushrooms. Cook for approximately 4-5 minutes. Add the caramelized onion and stir in scallions. Remove from heat.
  3. Heat your Panini press. Spread each ciabatta with 1 tablespoon of dijon mustard and distribute mushroom onion mixture between two slices of bread. Place 2 slices of Swiss cheese on each piece of bread.
  4. Lightly brush tops of bread with olive oil. Place sandwiches onto hot panini press. Cook for approximately 4-5 minutes until bread is toasted and cheese has melted.


If you don't have a panini press, you can use a cast iron skillet with a foiled covered brick or a george forman grill works great too.


Onion mushroom swiss panini

Caramelized Onions, Sautéed Mushrooms, scallions, swiss cheese, dijon on ciabatta bread pressed until crispy on the outside and ooey-gooey melted cheesy goodness on the inside.



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