Grilled French Onion Egg Salad Sandwich

Name: Grilled French Onion Egg Salad Sandwich
Prep time: 30 min
Cook time: 15 min
Total time: 45 min
Yield: 1 servings
Cuisine: American
Ingredients: 1 medium yellow onion, thinly sliced; 1 tbsp olive oil; 1/4 tsp salt; 5 large eggs; 3 tbsp mayonnaise; 1 tsp Dijon mustard; 1 tsp Worcestershire sauce; 1/2 tsp onion powder; 1/2 tsp fresh thyme, finely chopped; black pepper, to taste; 2 slices sourdough bread; 1/4 cup shredded Gruyère cheese; 1 tbsp butter; 1 tsp fresh chives, chopped, for garnish; flaky sea salt, for garnish

This grilled French onion egg salad sandwich combines creamy, mustard-spiked egg salad with rich caramelized onions and melted Gruyère on toasted sourdough, bringing French onion soup flavors into handheld form.

🌍American 🏷️Egg salad 🏷️Sandwich 🏷️Grilled cheese 🏷️French onion Gruyere

🏷️

🏷️Caramelized onion

-0:00

toasted.tableonTikTok

Total

45 min

Servings

1

Difficulty

Easy

Est. Cost

$28–$46

Recipe Source

View original recipe

From TikTok · by toasted.table

-0:00

toasted.tableonTikTok

Ingredients

1 medium yellow onion, thinly sliced
1 tbsp olive oil
1/4 tsp salt
5 large eggs
3 tbsp mayonnaise
1 tsp Dijon mustard
1 tsp Worcestershire sauce
1/2 tsp onion powder
1/2 tsp fresh thyme, finely chopped
black pepper, to taste
2 slices sourdough bread
1/4 cup shredded Gruyère cheese
1 tbsp butter
1 tsp fresh chives, chopped, for garnishoptional
flaky sea salt, for garnishoptional

15 Ingredients

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Instructions

1
In a skillet over medium-low heat, add olive oil. Add the thinly sliced onions and a pinch of salt. Cook slowly, stirring occasionally, until deeply caramelized. Set aside.
2
Bring a pot of water to a boil. Gently lower in the eggs and cook for exactly 8.5 minutes.
3
Immediately transfer the cooked eggs to an ice bath to stop the cooking process. Let them cool completely.
4
Peel the cooled eggs and roughly chop them. Transfer to a mixing bowl.
5
To the bowl with the chopped eggs, add mayonnaise, Dijon mustard, Worcestershire sauce, the reserved caramelized onions, onion powder, fresh thyme, salt, and pepper.
6
Gently mix all the ingredients together until just combined.
7
Spread the egg salad mixture evenly on one slice of sourdough bread.
8
Top the egg salad with shredded Gruyère cheese and place the second slice of bread on top.
9
Melt butter in a skillet over medium heat. Carefully place the sandwich in the pan.
10
Grill the sandwich for 2-3 minutes per side, until the bread is golden brown and toasted, and the cheese is fully melted.
11
Remove the sandwich from the pan. Garnish with chopped fresh chives and a sprinkle of flaky sea salt.
12
Slice in half and serve immediately.

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Tips & Notes

Pro tips

Caramelize onions low and slow (20-25 minutes) for maximum sweetness and depth—resist the urge to rush this step.
Chop eggs into small, uniform pieces rather than mashing for better texture and flavor distribution throughout the salad.
Butter the bread exterior generously before grilling to create a crispy, golden crust and prevent sogginess.
Use medium-low heat on your griddle or skillet to melt the Gruyère evenly without burning the bread.