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Instant Pot French Onion Chicken Thighs

Tender pressure-cooked chicken thighs with deeply caramelized onions, savory beef broth gravy, and melted Gruyère in a single pot, ready in under an hour.
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Prep Time 10 minutes
Cook Time 45 minutes
Total Time 55 minutes
Servings: 4 servings
Course: Dinner, Main Course
Cuisine: American, French-American
Calories: 465
Ingredients Equipment Method Notes

Ingredients
  

  • 6 boneless skinless chicken thighs
  • 0.5 cup all-purpose flour for dredging
  • 1 tsp salt
  • 0.5 tsp black pepper
  • 1 tbsp unsalted butter for searing
  • 1 tbsp olive oil for searing
  • 2 tbsp unsalted butter for caramelizing onions
  • 2 large sweet onions such as Vidalia, thinly sliced
  • 1 cup low-sodium beef stock
  • 2 tbsp balsamic vinegar
  • 1 tsp dried thyme or 3 fresh sprigs
  • 0.5 tsp dried oregano
  • 1.5 tbsp cornstarch mixed with 2 tablespoons cold water for slurry
  • 0.5 cup shredded mozzarella or Gruyère cheese Gruyère recommended for authentic French onion flavor
  • fresh parsley chopped, for garnish

Equipment

  • Instant Pot or electric pressure cooker
  • Shallow bowl for dredging
  • wooden spoon

Method
 

  1. Combine flour, salt, and pepper in a shallow bowl. Lightly coat each chicken thigh on both sides and shake off the excess.
  2. Set Instant Pot to Sauté on High. Add 1 tablespoon each of butter and olive oil. Sear chicken thighs in batches for 4 minutes per side until golden brown. Remove and set aside.
  3. Add remaining 2 tablespoons butter to the pot. Add sliced onions and sauté for 8 to 10 minutes, stirring frequently, until soft and deeply golden.
  4. Pour in balsamic vinegar and scrape the bottom of the pot thoroughly with a wooden spoon to release all browned bits.
  5. Add beef stock, thyme, and oregano. Stir to combine. Liquid should appear thin; add an extra ¼ cup broth if the mixture looks thick.
  6. Nestle chicken thighs into the pot, partially submerging them in the liquid. Secure the lid, set valve to Sealing, and pressure cook on High for 9 minutes.
  7. Allow 10-minute natural pressure release, then carefully turn valve to release remaining steam.
  8. Remove chicken and set aside. Turn pot to Sauté. Whisk cornstarch with cold water until smooth, then stir slurry into the bubbling liquid. Simmer 2 minutes until sauce thickens into a gravy.
  9. Return chicken to the pot. Spoon sauce and onions over each piece. Sprinkle cheese evenly over the top. Replace lid with pot off for 2 to 3 minutes until cheese melts from residual heat.
  10. Garnish with fresh parsley and serve over mashed potatoes, egg noodles, or with crusty bread.

Notes

Storage: Refrigerate in an airtight container for up to 3 days. Flavor deepens overnight. Freeze for up to 3 months in individual portions. Reheat over medium-low heat with a splash of beef broth to loosen the sauce. If beef stock is unavailable, use chicken stock plus 1 teaspoon Worcestershire sauce. Swiss or provolone can substitute for Gruyère. Gluten-free: use a 1:1 gluten-free flour blend for dredging. Always use cold water for the cornstarch slurry to prevent clumping.