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A golden-brown Chicken Spinach Mushroom Bake in a white casserole dish, fresh out of the oven and ready to serve.

Ultimate Chicken Spinach Mushroom Bake

This one-pan wonder features tender seared chicken, earthy mushrooms, and vibrant spinach in a luscious, cheesy cream sauce. It's an indulgent yet surprisingly light keto-friendly meal that feels elegant enough for guests but is easy enough for a weeknight. A bubbling, golden-brown masterpiece that promises pure comfort in every bite.
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Prep Time 15 minutes
Cook Time 25 minutes
Total Time 40 minutes
Servings: 4
Course: Main Course
Cuisine: American, Italian-American
Calories: 650
Ingredients Equipment Method Notes

Ingredients
  

  • 2 large boneless, skinless chicken breasts, sliced horizontally into 4 thin cutlets
  • 1 tbsp olive oil
  • 2 tbsp butter, divided
  • 8 oz cremini mushrooms, sliced
  • 4 cloves garlic, minced
  • 1/2 cup chicken broth
  • 4 oz full-fat cream cheese, softened
  • 1/2 cup freshly grated Parmesan cheese
  • 5 oz fresh spinach
  • 1 tsp Italian seasoning
  • 1/2 tsp salt, or to taste
  • 1/4 tsp black pepper, or to taste
  • 1 cup shredded mozzarella cheese

Equipment

  • Large Oven-Safe Skillet (10-12 inch)
  • Cutting board
  • Chef's knife
  • Measuring cups and spoons
  • Whisk
  • Wooden spoon or spatula
  • Plate
  • Meat thermometer

Method
 

  1. Preheat the oven to 400°F (200°C). Pat the chicken cutlets dry with a paper towel and season them generously on both sides with salt, pepper, and Italian seasoning.
  2. Heat the olive oil and one tablespoon of butter in a large, oven-safe skillet over medium-high heat. Once hot, sear the chicken for 3-4 minutes per side until deeply golden. The chicken will not be fully cooked. Remove it from the skillet and set aside on a plate.
  3. Reduce the heat to medium and add the remaining tablespoon of butter to the skillet. Add the sliced mushrooms and a pinch of salt. Cook, stirring occasionally, for 5-7 minutes, until they have released their liquid and started to brown.
  4. Add the minced garlic and cook for one minute more until fragrant, being careful not to burn it.
  5. Pour in the chicken broth to deglaze the pan. Use a wooden spoon to scrape up all the browned bits from the bottom of the skillet. Let the broth simmer for a minute to reduce slightly.
  6. Reduce the heat to low. Add the softened cream cheese and the grated Parmesan cheese, whisking constantly until the cream cheese is fully melted and the sauce is smooth and creamy.
  7. Add the fresh spinach to the skillet in large handfuls. Stir it into the hot sauce until it wilts down, which should take 1-2 minutes. Taste the sauce and adjust the seasoning with more salt and pepper if needed.
  8. Nestle the seared chicken cutlets back into the skillet, tucking them into the creamy spinach and mushroom sauce. Spoon some of the sauce over the top of the chicken.
  9. Sprinkle the shredded mozzarella cheese evenly over the entire skillet.
  10. Transfer the skillet to the preheated oven and bake for 15-20 minutes, or until the chicken is cooked through (reaches an internal temperature of 165°F) and the cheese is melted, bubbly, and golden brown.
  11. Let the bake rest for 5 minutes before serving to allow the sauce to set slightly.

Notes

Variations: For extra flavor, add 1/4 cup of chopped sun-dried tomatoes with the garlic, or a pinch of nutmeg to the cream sauce to enhance the spinach.
Ingredient Swaps: Boneless, skinless chicken thighs can be used instead of breasts; just add a few extra minutes to the cooking time. If using frozen spinach, ensure it is completely thawed and squeezed dry to prevent a watery sauce.
Cooking Tips: To avoid a grainy sauce, always add the cream cheese over low heat and whisk gently until smooth. Do not let the sauce boil after adding the cheese.
Serving Suggestions: For a low-carb meal, serve with cauliflower rice or zucchini noodles. It is also delicious with pasta, creamy polenta, or crusty bread for dipping.