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French Onion Skillet Sauce Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.3 from 59 reviews
  • Author: Kimberly
  • Prep Time: 10 minutes
  • Cook Time: 30 minutes
  • Total Time: 40 minutes
  • Yield: 4 servings
  • Category: Sauce
  • Method: Stovetop
  • Cuisine: French-American
  • Diet: Vegetarian

Description

This rich and flavorful French Onion Skillet Sauce is made by slowly caramelizing onions and then simmering them in a savory broth with white wine, garlic, thyme, and Worcestershire sauce. Perfect as a topping over steak, chicken, burgers, or mashed potatoes, it adds a deep, savory complexity to any dish. Easily adaptable to vegetarian diets by swapping beef broth for vegetable broth, this sauce elevates everyday meals with its classic French-American flavor.

Ingredients

Ingredients

  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 2 large yellow onions, thinly sliced
  • 2 cloves garlic, minced
  • 1 tablespoon all-purpose flour
  • 1/2 cup dry white wine (or beef broth)
  • 1 cup beef broth
  • 1 teaspoon Worcestershire sauce
  • 1/2 teaspoon fresh thyme leaves (or 1/4 teaspoon dried thyme)
  • Salt and black pepper to taste

Instructions

  1. Caramelize Onions: In a large skillet over medium heat, melt the butter with olive oil. Add the thinly sliced onions and cook slowly, stirring often, for about 15–20 minutes until they become deeply golden and caramelized.
  2. Add Garlic: Stir in the minced garlic and cook for an additional 1 minute to release its aroma without burning.
  3. Incorporate Flour: Sprinkle the all-purpose flour over the onions and stir well to coat them evenly. Cook for another minute to remove the raw flour taste.
  4. Deglaze Pan: Pour in the dry white wine to deglaze the pan, scraping up any browned bits stuck to the bottom for added flavor.
  5. Add Broth and Seasonings: Pour in the beef broth, add the Worcestershire sauce and thyme leaves, then bring the mixture to a gentle simmer.
  6. Simmer Sauce: Let the sauce cook for 5–7 minutes, allowing it to thicken slightly and the flavors to meld together.
  7. Season to Taste: Finally, season the sauce with salt and black pepper based on your preference. Serve warm over your favorite proteins or mashed potatoes.

Notes

  • For a vegetarian version, substitute vegetable broth for beef broth.
  • To make the sauce richer, stir in a splash of heavy cream or a bit of shredded Gruyère cheese at the end of cooking.
  • Be patient while caramelizing onions; slow cooking ensures deep flavor development without burning.
  • Use dry white wine or substitute with beef broth if avoiding alcohol.

Find it online: https://slsrecipes.com/french-onion-skillet-sauce-recipe/