A delicious, oven-baked Mediterranean-style casserole made with tender chicken breast, fresh zucchini, juicy tomatoes, melted mozzarella, Parmesan cheese, garlic, and Italian herbs. It is naturally gluten-free, high in protein, and perfect for a family dinner.
Preparation time: 15 minutes
Cooking time: 30–40 minutes
Total time: 45–55 minutes
Servings: 4
Oven temperature: 200°C (400°F)
Difficulty: Easy
Ingredients
For the chicken and vegetables
600 g boneless, skinless chicken breast, cut into 2.5 cm cubes
2 medium zucchini (approximately 400 g), sliced into rounds or half-moons
250 g cherry tomatoes, halved, or 2 medium tomatoes, chopped
1 small red onion, thinly sliced (optional)
3 garlic cloves, minced
2 tablespoons olive oil
1 teaspoon dried oregano
1 teaspoon dried Italian herbs
½ teaspoon paprika
½ teaspoon salt, or to taste
½ teaspoon freshly ground black pepper
½ teaspoon dried thyme
¼ teaspoon red chili flakes (optional)
1 tablespoon fresh lemon juice
For the cheese topping
150 g shredded mozzarella cheese
40 g grated Parmesan cheese
1 tablespoon chopped fresh parsley or basil
½ teaspoon dried oregano, for sprinkling
Cheese alternatives: Use a low-moisture mozzarella for a less watery bake. You can substitute another good melting cheese, although the flavor and nutritional values will differ.
Instructions
Step 1: Prepare the oven and baking dish
Preheat your oven to 200°C (400°F), or 180°C (350°F) for a fan-assisted oven.
Lightly grease a 9 × 13-inch baking dish with a little olive oil.
Wash and dry the zucchini and tomatoes thoroughly. Cut the chicken into evenly sized cubes so that it cooks uniformly.
Step 2: Season the chicken
Place the cubed chicken in a large bowl.
Add the olive oil, minced garlic, oregano, Italian herbs, paprika, thyme, salt, black pepper, chili flakes, and lemon juice.
Mix thoroughly until every piece of chicken is coated in the seasoning.
Leave to marinate for 10–15 minutes while preparing the vegetables, if time permits.
Step 3: Prepare the vegetables
Slice the zucchini into rounds approximately ½ cm thick. Cut larger rounds in half.
Halve the cherry tomatoes or chop regular tomatoes into bite-sized pieces.
If using red onion, slice it thinly.
If the zucchini is particularly watery, pat it dry with paper towels. Avoid slicing it too thinly, as it may become mushy during baking.
Step 4: Assemble the casserole
Arrange the seasoned chicken in the prepared baking dish.
Add the zucchini, tomatoes, and red onion.
Toss gently to distribute the ingredients evenly.
Sprinkle the Parmesan cheese over the chicken and vegetables.
Bake uncovered for approximately 20–25 minutes.
Step 5: Add the mozzarella
Remove the dish carefully from the oven.
Sprinkle the shredded mozzarella evenly over the top.
Return the dish to the oven for another 10–15 minutes, until the cheese is melted and golden in spots.
Check the thickest chicken pieces with a food thermometer. Chicken should reach an internal temperature of 74°C (165°F).
If the chicken is cooked but the cheese needs more color, broil or grill for 1–3 minutes, watching closely to prevent burning.
Step 6: Rest and serve
Remove the casserole from the oven.
Let it rest for 5 minutes so the juices settle.
Garnish with fresh parsley or basil and, if desired, a little extra black pepper.
Serve warm with a green salad, roasted vegetables, rice, quinoa, or crusty bread.
Nutrition Information
Estimated nutrition per serving, assuming the recipe makes four servings and uses the listed ingredients.
Nutrient
Approximate amount
Calories
450–500 kcal
Protein
52–58 g
Total fat
19–23 g
Saturated fat
8–10 g
Carbohydrates
10–14 g
Dietary fiber
2–4 g
Total sugars
5–7 g
Sodium
650–850 mg
Values vary according to the chicken cut, cheese brands, salt quantity, and exact serving size. These estimates do not include optional side dishes.
Nut Information and Allergen Guide
Does this recipe contain nuts?
No. The standard recipe contains no tree nuts or peanuts. Olive oil is used instead of nut oil.
However, if you have a nut allergy, check the labels on the mozzarella, Parmesan, dried herbs, and other packaged ingredients for allergen warnings or cross-contact statements. Prepare the dish using clean utensils and surfaces if necessary.
Dietary consideration
Information
Peanuts
Not included
Tree nuts (almonds, walnuts, cashews, etc.)
Not included
Gluten
Naturally gluten-free when all ingredients are uncontaminated
Dairy
Contains mozzarella and Parmesan
Eggs
Not included in the standard recipe
Soy
Not included in the standard recipe; check packaged ingredient labels
Sesame
Not included in the standard recipe
Low-carb
Suitable for many lower-carbohydrate diets
Keto-friendly
May fit a keto plan depending on portion size and individual carbohydrate limits
For a dairy-free version: Use a suitable dairy-free melting cheese and omit the Parmesan or replace it with a dairy-free alternative. Check product labels for allergy safety.
Tips for the Best Chicken Zucchini Bake
Prevent watery vegetables: Do not overcrowd the baking dish. Use a large dish and pat the zucchini dry before adding it.
Keep the chicken tender: Cut the chicken into similar-sized pieces and avoid overbaking. Use a thermometer to confirm doneness.
Get golden cheese: Add the mozzarella toward the end of baking instead of at the beginning.
Boost Mediterranean flavor: Add sliced black olives, a few chopped sun-dried tomatoes, or a small amount of crumbled feta.
Make it spicier: Increase the chili flakes or add a pinch of cayenne pepper.
Add more vegetables: Bell peppers, mushrooms, and spinach work well. If using spinach, stir it in near the end to avoid excess moisture.
Storage and Reheating
Refrigerator: Store leftovers in an airtight container for up to 3–4 days.
Freezer: Freeze cooled portions in airtight, freezer-safe containers for up to 2–3 months for best quality. Zucchini may become softer after thawing.
Oven reheating: Cover with foil and reheat at 175°C (350°F) until heated through.
Microwave reheating: Heat individual portions in short intervals, stirring or rearranging pieces as needed.
Refrigerate leftovers within two hours of cooking, and reheat to 74°C (165°F).
Questions and Answers (Q&A)
Q1. Can I use chicken thighs instead of chicken breast?
Yes. Boneless, skinless chicken thighs are an excellent substitute and tend to remain juicy. Cut them into similar-sized pieces and confirm they reach 74°C (165°F).
Q2. Should I cook the chicken before putting it in the oven?
No. The chicken can be added raw, provided it is cut into evenly sized pieces and cooked thoroughly in the oven. Avoid washing raw chicken, as splashing can spread bacteria.
Q3. How do I stop the casserole from becoming watery?
Dry the vegetables well, avoid overcrowding the dish, and use a baking dish large enough to let moisture evaporate. If your tomatoes are particularly juicy, remove some of their seeds before adding them.
Q4. Can I prepare this recipe ahead of time?
Yes. You can chop the vegetables and season the chicken in advance, storing them separately in the refrigerator. For the best texture and food safety, assemble and bake shortly before serving. If assembling with raw chicken, refrigerate promptly and cook within a safe storage period.
Q5. Can I make this recipe without mozzarella?
Yes. You can use extra Parmesan, feta, or another melting cheese. Feta gives the dish a saltier Mediterranean flavor, while Parmesan alone produces a more lightly browned topping.
Q6. Is Mediterranean Chicken Zucchini Bake good for weight management?
It can be a useful option because it provides lean protein and vegetables. The overall calories depend on the amount of oil and cheese used, as well as the portion size and accompanying sides.
Q7. Is this recipe suitable for people with diabetes?
It is relatively low in carbohydrates compared with casseroles made with pasta or potatoes. Individual nutritional needs vary, so consider the portion size and any accompanying rice, bread, or other carbohydrate sources.
Q8. Can I use frozen zucchini?
Fresh zucchini is recommended because frozen zucchini releases more water and may become soft. If using frozen zucchini, thaw it completely, drain it, and pat it dry before adding it.
Q9. What can I serve with this bake?
Good options include a Greek salad, steamed green beans, cauliflower rice, quinoa, brown rice, or whole-grain bread. For a lower-carbohydrate meal, serve it with a leafy salad or roasted vegetables.
Q10. How do I know when the chicken is fully cooked?
The safest method is to check the thickest pieces with a food thermometer. The internal temperature must reach 74°C (165°F). Do not rely solely on the color of the meat or the appearance of the melted cheese.
Q11. Can I make this recipe dairy-free and nut-free?
Yes. Replace the dairy cheese with a suitable dairy-free alternative and continue using olive oil. Choose products that meet your specific allergy requirements and check for cross-contact warnings.
Q12. Can I add rice or potatoes to the baking dish?
Yes, but the cooking method will need adjusting. Rice generally requires additional liquid and a longer cooking time, while potatoes should be cut small and partially cooked beforehand to ensure they become tender without overcooking the chicken.