Chicken Spinach and Mushroom Low-Carb Oven Dish

Description

This Chicken Spinach and Mushroom Low-Carb Oven Dish is a creamy, cheesy, protein-packed dinner featuring juicy seasoned chicken, tender mushrooms, fresh spinach, garlic, and a rich Parmesan cream sauce. Everything is finished in the oven beneath a layer of bubbling mozzarella until beautifully golden. With no pasta, rice, or breadcrumbs required, it’s a satisfying lower-carb meal that still delivers plenty of comfort-food flavor. The combination of savory mushrooms, garlicky spinach, tender chicken, and creamy cheese sauce makes this an easy family dinner that tastes restaurant-worthy while using simple ingredients.

Ingredients For the Chicken

• 1½ lbs boneless, skinless chicken breasts
• 1½ tbsp olive oil
• 1 tsp garlic powder
• 1 tsp Italian seasoning
• ½ tsp smoked paprika
• ¾ tsp salt
• ½ tsp freshly ground black pepper

For the Spinach & Mushrooms

• 8 oz cremini or button mushrooms, sliced
• 5 oz fresh baby spinach
• 3 garlic cloves, finely minced
• 1 tbsp unsalted butter
• ¼ tsp salt
• ¼ tsp black pepper

For the Creamy Sauce

• 4 oz cream cheese, softened
• ¾ cup heavy cream
• ½ cup freshly grated Parmesan cheese
• ½ cup low-sodium chicken broth
• 1 tsp Dijon mustard
• ½ tsp Italian seasoning
• ¼ tsp garlic powder
• ¼ tsp crushed red pepper flakes, optional

For the Cheesy Topping

• 1 cup shredded mozzarella cheese
• ¼ cup freshly grated Parmesan
• 1 tbsp fresh parsley, chopped

Step-by-Step Instructions

1. Preheat the oven to 375°F (190°C).
2. Lightly grease a 9×13-inch baking dish and set aside.
3. Pat the chicken breasts dry with paper towels.
4. Cut the chicken into approximately 1½-inch chunks so the pieces cook evenly.
5. Place the chicken in a bowl and add garlic powder, Italian seasoning, smoked paprika, salt, and black pepper.
6. Toss until every piece is evenly seasoned.
7. Heat olive oil in a large skillet over medium-high heat.
8. Add the chicken in a single layer, working in batches if necessary.
9. Sear for approximately 2 minutes per side, just until lightly golden. The chicken does not need to cook completely because it will finish in the oven.
10. Transfer the browned chicken to the prepared baking dish.
11. Reduce the skillet heat to medium and add the butter.
12. Add the sliced mushrooms.
13. Cook for approximately 5–7 minutes, stirring occasionally, until the mushrooms release their moisture and develop golden-brown edges.
14. Add the minced garlic and cook for approximately 30 seconds until fragrant.
15. Add the fresh spinach in batches.
16. Stir gently until the spinach wilts, approximately 1–2 minutes.
17. Season lightly with salt and black pepper.
18. Spread the mushroom and spinach mixture around and over the chicken in the baking dish.
19. Reduce the skillet heat to medium-low.
20. Pour the chicken broth into the skillet and scrape up any flavorful browned bits.
21. Add the softened cream cheese.
22. Stir until the cream cheese melts into the broth.
23. Slowly pour in the heavy cream while stirring.
24. Add Parmesan, Dijon mustard, Italian seasoning, garlic powder, and optional red pepper flakes.
25. Cook gently for approximately 2–3 minutes, stirring until smooth and slightly thickened. Avoid vigorously boiling the cream sauce.
26. Pour the creamy sauce evenly over the chicken, mushrooms, and spinach.
27. Sprinkle shredded mozzarella over the entire dish.
28. Finish with the remaining Parmesan.
29. Place the baking dish in the preheated oven.
30. Bake for approximately 15–20 minutes, or until the chicken reaches 165°F (74°C) internally at its thickest point.
31. For a more golden, bubbling cheese topping, broil for approximately 1–2 minutes at the end, watching carefully.
32. Remove the casserole from the oven.
33. Allow it to rest for approximately 5 minutes so the creamy sauce can thicken slightly.
34. Sprinkle with fresh chopped parsley and black pepper.
35. Serve hot, spooning plenty of mushrooms, spinach, and creamy sauce over each portion.

Tips

• Don’t overcook the chicken. Sear it only briefly because it finishes cooking in the oven.
• Brown the mushrooms well before adding spinach. This prevents excess mushroom liquid from making the casserole watery.
• Fresh spinach works particularly well, but frozen spinach can be used if thawed and squeezed extremely dry.
• Use freshly grated Parmesan because it melts more smoothly into the sauce.
• For extra garlic flavor, add another minced garlic clove.
• Don’t skip the resting time after baking; the sauce naturally thickens as it cools slightly.
• For extra heat, increase the crushed red pepper flakes.
• Chicken thighs can replace chicken breasts for an even juicier version.

Notes

This dish is naturally satisfying without a traditional starch. For a lower-carb dinner, serve it with roasted broccoli, cauliflower rice, zucchini noodles, asparagus, green beans, or a crisp side salad. If carbohydrates aren’t a concern, the creamy sauce is also excellent over pasta, mashed potatoes, or rice. Refrigerate leftovers promptly in an airtight container for up to 3–4 days and reheat gently to prevent the cream sauce from separating.

Q&A

Can I use chicken thighs instead of breasts?
Yes. Boneless, skinless chicken thighs work beautifully and tend to remain especially juicy.
Can I use frozen spinach?
Yes. Thaw it completely and squeeze out as much water as possible before adding it.
Why is my casserole watery?
Mushrooms and spinach naturally contain a lot of water. Properly browning the mushrooms and cooking excess moisture from the spinach helps prevent a watery sauce.
Can I prepare it ahead?
You can prepare the chicken, vegetables, and sauce ahead and refrigerate them separately. Assemble and bake when you’re ready to serve.
Can I add bacon?
Yes. A small amount of cooked, crumbled bacon makes a flavorful low-carb addition.
What other cheese can I use?
Provolone, Monterey Jack, Gruyère, or a mild white cheddar can replace some of the mozzarella.

Servings

Makes approximately 6 servings

Nutrition (Approx. Per Serving)

• Calories: 470
• Protein: 38g
• Carbohydrates: 8g
• Net Carbs: approximately 6g
• Fat: 32g
• Saturated Fat: 17g
• Fiber: 2g
• Sugar: 3g
• Sodium: 610mg
• Cholesterol: 145mg
• Potassium: 760mg
  Nutritional values are estimates and may vary depending on the chicken, cream, cheeses, mushrooms, and serving size.