Cheesy Spinach & Chicken Casserole

*Intensity scale: 1 = very easy / 5 = very challenging*

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Ingredients

For the casserole base:

• 1.5 lbs (680g) boneless, skinless chicken breasts (or thighs for extra juiciness)

• 2 tbsp olive oil, divided

• 1 medium yellow onion, finely diced

• 3 cloves garlic, minced

• 8 oz (225g) fresh baby spinach (about 8 cups, packed)

• 1 tsp salt

• ½ tsp black pepper

• ½ tsp paprika

• ¼ tsp ground nutmeg (enhances the spinach & cheese)

For the creamy cheese sauce:

• 4 oz (113g) cream cheese, softened and cut into cubes

• ½ cup (120ml) heavy cream (or half-and-half for lighter)

• ½ cup (120ml) low-sodium chicken broth

• 1 ½ cups (170g) shredded mozzarella cheese, divided

• ½ cup (50g) freshly grated Parmesan cheese

• ¼ cup (25g) shredded sharp cheddar cheese (for topping)

Optional garnish:

• Fresh parsley or chives, chopped

• Red pepper flakes (for heat)

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Nutrition Information (Per Serving)

Serves 6 | Serving size: ~1.25 cups

Nutritional values are estimates based on standard ingredients. For precise dietary tracking, use your preferred nutrition calculator with exact brands.

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Equipment Needed

• Large skillet or sauté pan (12-inch)

• 9×13-inch (3-quart) baking dish

• Wooden spoon or silicone spatula

• Cutting board and chef’s knife

• Measuring cups and spoons

• Cheese grater (fresh shredding is highly recommended)

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Instructions

Step 1: Prep and Preheat (Intensity: Low)

Preheat your oven to 375°F (190°C). Lightly grease your 9×13 baking dish with non-stick spray or a thin layer of butter.

Step 2: Cook the Chicken (Intensity: Medium)

Pat the chicken breasts completely dry with paper towels. Season both sides with ½ tsp salt, ¼ tsp pepper, and the paprika.
Heat 1 tablespoon of olive oil in the large skillet over medium-high heat. Once shimmering, add the chicken. Cook for 5–6 minutes per side until golden brown and cooked through (internal temp 165°F/74°C). Transfer chicken to a plate and let rest for 5 minutes, then dice or shred into bite-sized pieces. Don’t clean the skillet – those browned bits are flavor.

Step 3: Sauté Aromatics & Wilt Spinach (Intensity: Low)

Reduce heat to medium. Add the remaining 1 tablespoon of olive oil. Sauté the diced onion for 3 minutes until translucent. Add minced garlic and cook for 30 seconds until fragrant.
Begin adding the fresh spinach in handfuls. Stir constantly; it will look like a mountain but will shrink dramatically. Cook for 2–3 minutes until completely wilted. Season with nutmeg and remaining ½ tsp salt and ¼ tsp pepper.

Step 4: Make the Creamy Cheese Sauce (Intensity: Medium – stirring required)

Reduce heat to low. Add the cream cheese cubes to the skillet. Stir continuously until melted and smooth – about 1 minute.
Pour in the heavy cream and chicken broth. Stir to combine, scraping up any browned bits from the bottom of the pan. Let it gently simmer for 2 minutes until slightly thickened.
Remove skillet from heat. Add 1 cup of shredded mozzarella and all of the Parmesan cheese. Stir until the cheese is fully melted into a luscious sauce.

Step 5: Assemble the Casserole (Intensity: Low)

Return the diced chicken to the skillet. Stir everything together until the chicken and spinach are evenly coated in the cheese sauce.
Pour the entire mixture into your prepared baking dish. Spread it into an even layer. Sprinkle the remaining ½ cup mozzarella and all of the shredded cheddar evenly over the top.

Step 6: Bake to Golden Perfection (Intensity: Zero – hands-off)

Place the casserole on the middle rack of the preheated oven. Bake uncovered for 15 minutes, then switch the oven to broil (high) for the final 2–3 minutes. Watch carefully during broiling – you want a bubbly, golden-brown crust, not burnt edges.

Step 7: Rest and Serve (Intensity: Low)

Remove from oven. Let the casserole rest for 5–10 minutes. This allows the sauce to set slightly so it won’t run all over the plate. Garnish with fresh parsley or chives. Serve warm.