Sharing is caring!

There’s something special about a grilled cheese sandwich, it’s a comfort food that all ages can enjoy, and usually pretty cost effective. That’s why I’m sharing my favorite grilled cheese and caramelized onion sandwich also known as a French onion grilled cheese

French Onion Grilled Cheese with Gruyere

French Onion Grilled Cheese

I’m not usually a person who really like crazy foods, but this French onion grilled cheese has become my favorite way to eat grilled cheese. Of course I add my own little twist to the sandwich, with my cheese and bread choices, and am sharing a few of my tips for making grilled cheese. If you’re looking for other comfort foods check out this Sweet Potato Quinoa Chili! Also, a great vegetarian comfort food! 

Is Mayo or Butter Better for Grilled Cheese?

I’ve been using mayo for grilled cheese for years, and really do prefer it over butter. Here’s some of the science behind why it works. The ingredients in store bought mayonnaise have a higher smoke point than butter, which means your grilled cheese lunch is more foolproof. You can cook the sandwich over (slightly) higher heat for a crisper exterior and fluffier interior, and that helps to let the cheese really melt. Mayonnaise is also way easier to spread across your bread.

Grilled Cheese with Gruyere & Caramelized OnionsBest cheese for a grilled cheese sandwich

To me one of the best things about a grilled cheese is the cheese. With so many wonderful options out there the question is often asked what’s the best cheese for grilled cheese, and I personally think it’s a combo of cheddar and gruyere together, but I’m also down for an all gruyere cheese sandwich too. A classic grilled cheese is made with American cheese and white bread (but I love sneaking in sharp cheddar too)! Real cheddar, a bit of provolone, creamy processed cheese, leftover brie from last night’s party. Any and all varieties work!


I love this sandwich and the the sweetness the caramelized onions add to it and the flavor of the cheese and bread.  Don’t get me wrong I still make the kids Kraft cheese slices and white bread, but it’s nice to switch it up and indulge in this delicious sandwich.

French Onion Grilled Cheese with gruyereOther Items You Can Add to Grilled Cheese

Don’t just limit yourself with cheese and bread. There’s a lot that can be added to a grilled cheese to elevate it, but it’s totally up to you, Sometimes it’s I just look around and see what I already have and add a little pizazz to my sandwich. 

  • Apples
  • Pears
  • Ham
  • Jams 
  • Tomato’s (fresh or sundried)
  • Prosciutto

French Onion Grilled Cheese

French Onion Grilled Cheese Square

How to make a French Onion Grilled Cheese

Prep Time 5 minutes
Cook Time 20 minutes
Total Time 25 minutes


  • · Onion
  • · Olive Oil
  • · Balsamic Vinegar
  • · Butter or Mayo
  • · Cheddar & Gruyere Cheese (Trader Joe's sells it)
  • · Rye & Pump Swirl Bread (I like Pepperidge Farms)


    1. Cut the onion into slices.
    2. Heat olive oil and add onion slices.
    3. Once onions start to brown add balsamic vinegar.
    4. While onions are cooking slice cheese thinly.
    5. Heat another pan on medium heat.
    6. Spread butter or mayo onto two slices of bread.
    7. Add cheese slices and caramelized onions onto bread.
    8. Place bread onto pan. Cook on each side for 3-5 minutes. Make sure bread doesn't burn and the cheese is fully melted.
    9. Remove from pan and let sit for 1 minute before slicing.

Did you make this recipe?

Please leave a comment on the blog or share a photo on Instagram

How do you like your grilled cheese?  

Sharing is caring!