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Grilled French Onion Chicken Sandwiches

a close up front view of a french onion chicken sandwich on a crumpled paper

These Grilled French Onion Chicken Sandwiches have juicy grilled chicken topped with melted Swiss cheese, caramelized onions, and fresh baby spinach on a lightly toasted deli sandwich bun. 

Scroll to bottom for full recipe card with ingredients.

These sandwiches are easy and delicious and make a great lunch, dinner, or fun date night meal idea.

The chicken can also be pan fried or broiled if you would rather not grill it.

My husband added horseradish sauce to his sandwich to kick it up a notch and loved it.

Don’t be afraid to experiment with customizing this sandwich to your personal taste.

How to make Grilled French Onion Chicken Sandwiches:

Slice the onion and separate into rings.

onions sliced for caramelizing

In large skillet, heat the oil over medium-low heat.

Add onion, sugar, onion powder, and garlic powder. Cook and stir often, about 20 minutes or until onions are soft and caramelized.

onions, sugar, onion powder, and garlic powder cooking in a skillet

Turn the heat to low and cover to keep warm.

Preheat the grill for direct grilling over medium-high heat.

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Place the two pieces of chicken between two sheets of plastic wrap and pound flat with a meat mallet. Click for a meat mallet.

two pieces of chicken pounded flat between plastic wrap

Transfer the chicken to the hot grill rack.

Close the lid and cook about 5-7 minutes.

two pieces of chicken grilling and two toasted sandwich buns on the warmer rack

Optional – place the sandwich rolls on the grill to toast the insides just until lightly browned. Move them to the top warming rack to keep warm while the chicken finishes cooking.

Flip the chicken over and cook another 5-7 minutes or until chicken loses its pink color throughout and internal temperature reaches 160 degrees F (71.11 C).

Place the Swiss cheese slices on top of the chicken pieces.

two pieces of grilled chicken topped with Swiss cheese

Close the lid and cook 1 minute or until cheese begins to melt.

Assemble the sandwiches using sandwich buns, spinach, chicken with Swiss cheese and caramelized onions.

Serve and enjoy!

a graphic of a french onion chicken sandwich on a crumpled paper

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Yield: 2

French Onion Chicken Sandwiches

a close up front view of a french onion chicken sandwich on a crumpled paper

These Grilled French Onion Chicken Sandwiches have juicy grilled chicken topped with melted Swiss cheese, caramelized onions, and fresh baby spinach on a lightly toasted deli sandwich bun.

Prep Time 5 minutes
Cook Time 30 minutes
Total Time 35 minutes

Ingredients

  • 2 Tbsp extra virgin olive oil
  • 1 small yellow onion
  • 1 tsp granulated sugar
  • 1/2 tsp onion powder
  • 1/2 tsp garlic powder
  • 2 boneless skinless chicken filets (4oz each)
  • 2 slices Swiss cheese
  • 2 hamburger buns (or deli sandwich buns)
  • 1 cup baby spinach

Instructions

  1. Slice the onion and separate into rings.
  2. In large skillet, heat the oil over medium-low heat.
  3. Add onion, sugar, onion powder, and garlic powder. Cook and stir often, about 20 minutes or until onions are soft and caramelized.
  4. Turn the heat to low and cover to keep warm.
  5. Preheat the grill for direct grilling over medium-high heat.
  6. Place the two pieces of chicken between two sheets of plastic wrap and pound flat with a meat mallet. Click for a meat mallet.
  7. Transfer the chicken to the hot grill rack.
  8. Close the lid and cook about 5-7 minutes.
  9. Optional – place the sandwich rolls on the grill to toast the insides just until lightly browned. Move them to the top warming rack to keep warm while the chicken finishes cooking.
  10. Flip the chicken over and cook another 5-7 minutes or until chicken loses its pink color throughout and internal temperature reaches 160 degrees F (71.11 C).
  11. Place the Swiss cheese slices on top of the chicken pieces.
  12. Close the lid and cook 1 minute or until cheese begins to melt.
  13. Assemble the sandwiches using sandwich buns, spinach, chicken with Swiss cheese and caramelized onions.

Notes

  • The chicken can also be pan fried or broiled if you would rather not grill it.
  • Try adding horseradish sauce to this sandwich to kick it up a notch. Don’t be afraid to experiment with customizing this sandwich to your personal taste.

Recommended Products

As an Amazon Associate and member of other affiliate programs, I earn from qualifying purchases.

Nutrition Information:

Yield:

2

Serving Size:

1

Amount Per Serving: Calories: 656Total Fat: 33gSaturated Fat: 12gTrans Fat: 0gUnsaturated Fat: 18gCholesterol: 168mgSodium: 414mgCarbohydrates: 30gFiber: 2gSugar: 7gProtein: 57g

Nutrition information is a guideline only, is calculated automatically by third party software, and absolute accuracy is not guaranteed.

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