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French Onion Chicken Casserole Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.9 from 28 reviews
  • Author: Lucy
  • Prep Time: 15 minutes
  • Cook Time: 1 hour 12 minutes
  • Total Time: 1 hour 27 minutes
  • Yield: 6 servings
  • Category: Main Course
  • Method: Baking
  • Cuisine: French-American
  • Diet: Low Lactose

Description

A comforting French Onion Chicken Casserole featuring caramelized onions, tender chicken, and cauliflower baked in creamy chicken soup and topped with melted cheddar or gouda cheese. Perfect for a hearty family meal served warm with crusty bread.


Ingredients

Scale

Main Ingredients

  • 2 tbsp olive oil
  • 3 large yellow onions, sliced
  • 1 pound chicken breast, cut into bite sized pieces
  • Kosher salt and pepper, to taste
  • 1 large cauliflower head, cut into bite sized florets
  • 30 ounces cream of chicken soup (2 x 15oz cans)
  • 1 cup cheddar or gouda cheese, shredded


Instructions

  1. Preheat Oven: Preheat the oven to 350°F to prepare for baking the casserole later.
  2. Caramelize Onions: Heat 2 tbsp olive oil in a large skillet over medium heat. Add the sliced onions and sauté, stirring frequently until golden and lightly caramelized, about 15 minutes.
  3. Prepare Cauliflower: While onions cook, cut the cauliflower into bite-sized florets and place them evenly in a 9×13-inch casserole dish. Season with salt and pepper.
  4. Cook Chicken: Add the chicken pieces to the skillet with caramelized onions. Season with salt and pepper and cook until chicken is mostly cooked through and no longer pink, about 8 minutes.
  5. Assemble Casserole: Pour the chicken and onion mixture over the cauliflower in the casserole dish. Add the cream of chicken soup on top and spread evenly.
  6. Bake Covered: Cover the casserole dish with aluminum foil and bake for 35 minutes until cauliflower is just fork-tender.
  7. Add Cheese and Bake: Remove foil, sprinkle the shredded cheddar or gouda cheese evenly over the top. Continue baking uncovered for an additional 15 minutes until the cheese is melted and bubbly.
  8. Serve: Let the casserole cool for 5-10 minutes before serving warm with crusty bread to enjoy the creamy sauce.

Notes

  • To replace canned cream of chicken soup, mix 1.5 cups broth/stock, 1.5 tbsp cornstarch, and 8 ounces softened cream cheese; blend until smooth before adding to casserole.
  • Cut cauliflower into uniform florets to ensure even cooking.
  • Stir onions frequently during caramelization to prevent burning and add a splash of water if they start scorching.
  • Partially cooking the chicken before baking helps lock in moisture and prevents overcooking.
  • Allow the casserole to cool slightly before serving for better texture and to avoid burns.
  • Store leftovers in an airtight container in the fridge for up to 3 days or freeze up to 3 months, thaw overnight in fridge before reheating.

Nutrition

  • Serving Size: 1 serving
  • Calories: 420 kcal
  • Sugar: 7 g
  • Sodium: 850 mg
  • Fat: 18 g
  • Saturated Fat: 7 g
  • Unsaturated Fat: 9 g
  • Trans Fat: 0 g
  • Carbohydrates: 20 g
  • Fiber: 5 g
  • Protein: 38 g
  • Cholesterol: 95 mg