A delicious oven-baked chicken casserole featuring juicy, tender chicken breasts, fresh zucchini, sweet cherry tomatoes, garlic, Italian herbs and a generous layer of golden melted mozzarella cheese.
This is an easy, family-friendly dinner that is flavorful, protein-rich and perfect for serving with rice, pasta or garlic bread.
1. Recipe details
Preparation time: 15 minutes
Cooking time: 30–40 minutes
Total time: 45–55 minutes
Servings: 4
Difficulty: Easy
Cuisine: Italian-inspired
Cooking method: Oven baking
Course: Lunch / Dinner
2. Ingredients
Chicken
600 g boneless, skinless chicken breasts
1 tbsp olive oil
½ tsp salt
½ tsp black pepper
1 tsp paprika
1 tsp Italian seasoning
½ tsp garlic powder
½ tsp onion powder
Vegetables
2 medium zucchini, sliced into rounds
1½ cups cherry tomatoes, halved
3 garlic cloves, minced
½ small onion, thinly sliced (optional)
1 tbsp olive oil
½ tsp salt
¼ tsp black pepper
½ tsp dried oregano
½ tsp dried basil
Cheese topping
1½ cups shredded mozzarella cheese
¼ cup grated Parmesan cheese
1 tbsp fresh parsley, chopped
½ tsp Italian seasoning
Optional ingredients
½ tsp chili flakes
1 tbsp lemon juice
1 tbsp butter
2 tbsp cream for a creamier casserole
3. Step-by-step cooking instructions
Step 1: Prepare the chicken
Preheat the oven to 200°C (400°F).
Clean and pat the chicken breasts dry with paper towels.
If the chicken breasts are thick, slice them horizontally or gently flatten them to an even thickness.
Place chicken in a large mixing bowl.
Add olive oil, salt, black pepper, paprika, garlic powder, onion powder and Italian seasoning.
Rub the seasoning evenly over the chicken.
Allow it to marinate for 10–15 minutes.
Step 2: Prepare the vegetables
Wash zucchini and cherry tomatoes thoroughly.
Cut zucchini into medium-sized rounds.
Slice cherry tomatoes in half.
Mince the garlic.
Place vegetables in a bowl.
Add olive oil, salt, black pepper, oregano and basil.
Toss gently until everything is evenly coated.
Step 3: Arrange the casserole
Lightly grease a baking dish with olive oil or butter.
Arrange seasoned chicken breasts in a single layer.
Distribute zucchini slices around and between the chicken.
Add halved cherry tomatoes.
Sprinkle minced garlic evenly over the vegetables.
Add a little extra Italian seasoning.
Step 4: Bake the chicken
Place the baking dish in the preheated oven.
Bake for approximately 20–25 minutes, depending on chicken thickness.
Check the thickest part of the chicken with a food thermometer.
Chicken must reach an internal temperature of 74°C (165°F).
Step 5: Add the cheese
Remove the baking dish from the oven once the chicken is cooked.
Sprinkle shredded mozzarella over the chicken and vegetables.
Add grated Parmesan cheese.
Sprinkle a little Italian seasoning.
Return the dish to the oven for another 5–8 minutes, until the cheese melts.
Step 6: Get the golden cheese topping
For a beautifully golden top:
Switch the oven to broil or grill.
Broil for approximately 1–2 minutes.
Watch carefully to prevent burning.
Remove when the cheese is bubbling and lightly golden.
Step 7: Garnish and serve
Sprinkle freshly chopped parsley over the casserole.
Add a little lemon juice if desired.
Allow the chicken to rest for 5 minutes.
Serve warm with the roasted vegetables and melted cheese.
4. Nutritional information
Estimated nutrition per serving, based on 4 servings.
Nutrient
Approximate amount
Calories
390 kcal
Protein
49 g
Carbohydrates
12 g
Total fat
17 g
Saturated fat
7 g
Dietary fiber
3 g
Sugar
6 g
Sodium
650 mg
Cholesterol
125 mg
Values vary depending on chicken size, cheese brands and ingredient quantities.
5. Nut information and allergens
Naturally nut-free recipe
The standard recipe does not contain peanuts or tree nuts.
Nut and allergen information
Allergen
Present?
Peanuts
No
Almonds
No
Cashews
No
Walnuts
No
Pistachios
No
Hazelnuts
No
Milk
Yes – mozzarella and Parmesan
Gluten
Usually no, but check seasoning labels
Soy
May be present in packaged cheese or seasonings
Eggs
Not required
Nut-free cooking precautions
Check mozzarella and Parmesan packaging for allergen warnings.
Check seasoning blends for possible cross-contact.
Use clean baking dishes and utensils.
If preparing food for someone with a severe nut allergy, verify all ingredient labels and manufacturing warnings.
Allergy-friendly substitutions
Dairy-free: Use suitable dairy-free mozzarella and Parmesan alternatives.
Gluten-free: Use certified gluten-free seasonings.
Lower-fat: Use reduced-fat mozzarella.
Lower-sodium: Reduce added salt and choose low-sodium cheese.
6. Serving suggestions
This baked chicken casserole pairs beautifully with:
Garlic bread.
Steamed white rice.
Buttered pasta.
Mashed potatoes.
Roasted potatoes.
Fresh garden salad.
Cauliflower rice for a lower-carbohydrate option.
7. Frequently asked questions (Q&A)
Q1. Can I use chicken thighs instead of chicken breasts?
Yes. Boneless chicken thighs work very well and generally remain juicier. Adjust baking time according to their thickness and check that the internal temperature reaches 74°C (165°F).
Q2. Can I use regular tomatoes instead of cherry tomatoes?
Absolutely. Use ripe Roma tomatoes or other firm tomatoes. Cut them into small wedges.
Q3. Why is my baked chicken watery?
Zucchini and tomatoes release moisture during baking. Avoid overcrowding the dish, use thicker zucchini slices and drain excess liquid if necessary.
Q4. Can I prepare this recipe without mozzarella?
Yes. You can use cheddar, Monterey Jack, provolone or another good melting cheese.
Q5. Can I make this recipe ahead of time?
Yes. Season the chicken and prepare the vegetables several hours ahead. Refrigerate separately in covered containers, then assemble and bake when ready.
Q6. How do I keep chicken breasts juicy?
Use evenly sized chicken pieces.
Avoid overcooking.
Coat the chicken with olive oil.
Use a thermometer to check doneness.
Allow chicken to rest for approximately 5 minutes.
Q7. Can I make this recipe in an air fryer?
Yes. Arrange chicken and vegetables in a suitable air-fryer-safe dish. Cook at approximately 180°C (356°F), checking the chicken temperature and adding cheese during the final few minutes. Cook in batches if necessary.
Q8. Can I add mushrooms?
Yes. Mushrooms are an excellent addition. Slice them and arrange them with the zucchini and tomatoes.
Q9. How long can I store leftovers?
Refrigerate leftovers in an airtight container for 3–4 days at 4°C (40°F) or below.
Q10. Can I freeze baked chicken casserole?
Yes. Freeze in airtight, freezer-safe containers for approximately 2–3 months for best quality. The zucchini may become softer after thawing.
Q11. Can I make this recipe spicy?
Yes. Add red chili flakes, cayenne pepper or chili powder to the chicken seasoning.
Q12. Is this recipe suitable for a low-carb diet?
It can fit many low-carb meal plans because chicken, zucchini, tomatoes and cheese are relatively low in carbohydrates. Check portion sizes and nutritional requirements.
Q13. Why is my mozzarella not turning golden brown?
Some mozzarella varieties contain more moisture and brown less readily. Use low-moisture shredded mozzarella and finish briefly under the broiler.
Q14. Can I use frozen vegetables?
Fresh zucchini and tomatoes are recommended for the best texture. Frozen vegetables can release additional moisture, so thaw and drain them before baking.
8. Chef’s tips for the best results
Choose chicken breasts of similar thickness to ensure even cooking.
Pat chicken dry before seasoning.
Do not slice zucchini too thinly.
Use ripe but firm cherry tomatoes.
Use low-moisture mozzarella for a better cheese topping.
Add Parmesan for a deeper savory flavor.
Avoid overcrowding the baking dish.
Use fresh parsley for a fresh finishing touch.
Do not overbake the chicken.
Rest the casserole briefly before serving.