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French Onion Grilled Cheese Sandwich

French Onion Grilled Cheese Sandwich


  • Author: OliviaBennett
  • Total Time: 30 mins

Description

When classic comfort food gets a gourmet twist—meet your new cold-weather obsession: the French Onion Grilled Cheese. Imagine sticky-sweet caramelized onions nestled between nutty, melty Gruyère, all hugged by buttery, golden sourdough. It’s basically your favorite soup… transformed into a crunchy, gooey masterpiece. One skillet, simple ingredients, pure cozy magic in under 30 minutes. Ready to turn a snow day (or any day) into something special? Let’s make it happen!


Ingredients

Scale
  • 2 medium yellow or sweet onions, thinly sliced

  • ½ cup grated Gruyère (or mix Gruyère, cheddar, mozzarella)

  • 2 slices sturdy bread (sourdough, country white, or rye)

  • 1 tbsp unsalted butter (softened)

  • 1 tbsp olive oil

  • Kosher salt, to taste


Instructions

1️⃣ Caramelize Onions: In a skillet, heat olive oil on medium-low. Add onions + a pinch of salt. Cook low & slow, stirring every 5–7 mins, for 20–25 mins until jammy, deep golden, and sweet. Deglaze with a splash of water if they stick. Transfer to a bowl; wipe out skillet.

2️⃣ Assemble: Sprinkle half the cheese on one bread slice. Top with onions. Add remaining cheese. Cap with second bread slice. Press gently.

3️⃣ Grill: Butter outsides. Heat skillet to medium. Grill 3–4 mins per side until bread is deeply golden & cheese is melted. Cover skillet for 1–2 mins if needed to help melt the cheese.

4️⃣ Serve: Rest 1 min, slice diagonally, and enjoy every gooey, crunchy bite!

Notes

  • Add thyme to onions for extra French onion soup vibes.

  • Stir in a splash of Worcestershire or red wine for umami.

  • Mix cheeses for max melt & flavor.

  • Dip in warm veggie broth for a “soup & sandwich” vibe!

Nutrition

  • Calories: 480 Per Sandwich
  • Fat: 28g
  • Carbohydrates: 36g
  • Protein: 20g