Instructions:
1. Prepare the Cod:
- Preheat your oven to 375°F (190°C).
- Season the cod fillets with olive oil, lemon juice, zest, minced garlic, salt, and pepper. Set aside to marinate for about 15 minutes.
2. Prep the Vegetables:
- Toss the broccoli, carrots, zucchini, cherry tomatoes, and onion with olive oil, Italian seasoning, salt, and pepper. Arrange them in a large baking dish.
3. Assemble the Gratin:
- Lay the marinated cod fillets on top of the vegetables.
- In a small bowl, mix the heavy cream, Parmesan cheese, mozzarella cheese, and Dijon mustard (if using). Pour the mixture evenly over the cod and vegetables.
- Sprinkle breadcrumbs over the top for a golden, crispy layer.
4. Bake:
- Cover the dish with foil and bake for 20 minutes.
- Remove the foil and bake for an additional 10-15 minutes, or until the cod is cooked through (flakes easily with a fork) and the gratin topping is golden and bubbly.
5. Garnish and Serve:
- Sprinkle fresh parsley over the gratin before serving.
- Pair with a side of crusty bread or rice for a complete meal.
This dish is the perfect balance of creamy, cheesy goodness with tender, flaky cod and roasted vegetables. Let me know how it turns out! 😊