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Cheesy Spinach & Chicken Casserole

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Total Time: 55 Minutes | Active Prep: 20 Minutes | Cook Time: 35 Minutes
Difficulty: Easy | Serves: 6

A comforting, all-in-one dish that’s perfect for busy weeknights or potluck dinners. Tender chicken, creamy ricotta, and vibrant spinach are enveloped in a rich, cheesy sauce, then baked until golden and bubbling. It’s hearty, nourishing, and guaranteed to be a family favorite.

Ingredients

  • 1.5 lbs (680g) boneless, skinless chicken breasts, cut into 1-inch cubes

  • 10 oz (285g) fresh spinach, roughly chopped

  • 1 medium yellow onion, diced

  • 3 cloves garlic, minced

  • 1 tbsp olive oil

  • 1 (15 oz) container whole-milk ricotta cheese

  • 1 cup (8 oz) sour cream

  • 1.5 cups (6 oz) shredded mozzarella cheese, divided

  • 1 cup (4 oz) shredded sharp cheddar cheese, divided

  • ½ cup (2 oz) grated Parmesan cheese

  • 1 tsp dried oregano

  • ½ tsp paprika

  • ½ tsp crushed red pepper flakes (optional)

  • Salt and freshly ground black pepper, to taste

  • Cooking spray or extra oil for greasing

Equipment

  • 9×13 inch (or similar 3-quart) baking dish

  • Large skillet

  • Large mixing bowl

  • Measuring cups and spoons

  • Knife and cutting board

Instructions

Step 1: Prep & Cook the Base (15 Minutes)

  1. Preheat your oven to 375°F (190°C). Lightly grease your baking dish with cooking spray or oil.

  2. Heat the olive oil in a large skillet over medium-high heat. Season the cubed chicken with salt and pepper. Add the chicken to the hot skillet and cook for 5-7 minutes, stirring occasionally, until the pieces are lightly browned and cooked through. Remove the chicken with a slotted spoon and set aside.

  3. In the same skillet (with any drippings), add the diced onion. Cook for 3-4 minutes until softened and translucent. Add the minced garlic and cook for another minute until fragrant.

  4. Add the chopped spinach to the skillet in handfuls, stirring until each addition wilts. This will take about 3-4 minutes total. Remove the skillet from the heat and let the mixture cool slightly.

Step 2: Combine the Creamy Mixture (5 Minutes)

  1. In your large mixing bowl, combine the ricotta cheese, sour cream, 1 cup of the mozzarella, ½ cup of the cheddar, and all of the Parmesan cheese.

  2. Add the oregano, paprika, red pepper flakes (if using), ½ teaspoon of salt, and ¼ teaspoon of black pepper. Stir until well combined.

  3. Add the cooked chicken and the slightly cooled spinach and onion mixture to the cheese bowl. Gently fold everything together until evenly incorporated.

Step 3: Assemble & Bake (35 Minutes)

  1. Transfer the entire mixture to your prepared baking dish, spreading it out into an even layer.

  2. Sprinkle the remaining ½ cup of mozzarella and ½ cup of cheddar cheese evenly over the top.

  3. Bake, uncovered, in the preheated oven for 30-35 minutes, or until the cheese on top is completely melted, golden in spots, and the casserole is bubbling around the edges.

  4. For an extra golden top, you can broil for the final 1-2 minutes—watch closely to prevent burning.

Step 4: Rest & Serve (Crucial!)

  1. This step is key for the perfect texture: Remove the casserole from the oven and let it rest on a cooling rack for at least 10 minutes before serving. This allows the creamy filling to set slightly, making it easier to slice and serve neat portions.

  2. Garnish with fresh herbs like chopped parsley or basil if desired, and serve warm.

Chef’s Notes & Variations

  • Make-Ahead: Assemble the casserole completely (without baking), cover tightly, and refrigerate for up to 24 hours. When ready to eat, bake as directed, adding 5-10 extra minutes to the bake time since it will be cold from the fridge.

  • Vegetarian Twist: Omit the chicken. Add 2 cups of another vegetable like sautéed mushrooms, sun-dried tomatoes, or artichoke hearts for a hearty meatless version.

  • Pasta Lover’s Version: Stir in 2 cups of cooked small pasta (like rotini or penne) with the chicken and spinach for an even more filling baked pasta casserole.

  • Storage: Store leftovers in an airtight container in the refrigerator for up to 4 days. Reheat portions in the microwave or a 350°F oven until warmed through.

Nutrition Information (Per Serving, 1 of 6)

  • Calories: ~520 kcal

  • Total Fat: 34g

    • Saturated Fat: 18g

  • Cholesterol: 145mg

  • Sodium: 580mg

  • Total Carbohydrates: 10g

    • Dietary Fiber: 2g

    • Sugars: 3g

  • Protein: 45g

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