Somewhat Simple

Grown Up Grilled Cheese Sandwich Recipe


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This Grown Up Grilled Cheese Sandwich is about to change the way you make this classic comfort food, forever!

I have fond memories of rainy days with grilled cheese and tomato soup- it’s like a childhood rite of passage, am I right?

In my house today, grilled cheese sandwiches are as popular as they were in my childhood home, but when I make them for me and my husband, I add a secret ingredient that changes {almost} everything.

And that secret ingredient is…


Yep, onions.

{Sauteed onions, to be exact}

I used to cry when I’d chop onions and I’d almost cry if I had to eat them! I hated onions and I never could understand why someone would waste food by adding an onion to it.

When I was a teenager, I was visiting my aunt and they had a friend of the family over who asked if I would like a grilled cheese sandwich. When he handed it to me, I almost died when he said he added some sauteed onions. My poor sandwich was ruined and I wanted to toss it in the garbage. He insisted that I try it, and so I did- only to be polite.

I took a bite.

And then my mouth liked it.

And I ended up devouring the entire thing. Probably faster than anyone in the room, actually.

It was delicious, and the way I would prepare the classic Grilled Cheese Sandwich would forever be changed. It was like I totally grew up that day or something. (‘Cause liking onions means you are mature, right?) It totally does.

The Grilled Cheese Sandwich was the food that changed me and my old aversion to onions.

Grown Up Grilled Cheese Sandwich


  • 2 slices of bread
  • cheese, any variety – grated (Make it as cheesy as you’d like!)
  • butter
  • several slices of onion, any variety – I’m using a purple onion this time, but yellow is also delicious!


  1. Place your onion slices in a small pan with a pat of butter. Cook over the stove on medium-high heat until they are translucent. This caramelizes them and brings out their sweetness – getting rid of the bitter taste… which still makes me want to scratch my tongue off. Once your onions have caramelized, remove them from the pan and set aside.

  2. Butter one side of each slice of bread, then place one piece butter-side down on the same small pan. Top the bread with some cheese, then the onions, then the top slice of bread, butter-side up. Cook on medium heat for just a minute or 2 or until the bread is golden. Flip to brown the other side and cook until the cheese is melted.

  3.  Eat and enjoy!!

Your tastes buds are going to love you.

And you will totally become more mature as soon as you swallow the last bite. I pinky promise.

This recipe originally published on Somewhat Simple in May 2012.

For more delicious and easy sandwich recipes, check out some of our favorites below!

Somewhat Simple Sandwiches

Avocado Tomato Grilled Cheese | Simple Caprese Sandwich | Chicken Caesar Salad Wraps

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