Casseroles have a way of making any table feel warm and welcoming. They’re hearty, versatile, and often bring together everyday ingredients in a way that feels like something truly special. This Baked Rice and Vegetable Egg Casserole with Mozzarella and Herb Mayo Sauce is the perfect example. It combines the simplicity of cooked rice and fresh vegetables with the richness of eggs and gooey mozzarella cheese. The herb mayo sauce gives it a creamy, zesty finish that elevates the whole dish. Whether you’re planning a cozy family dinner, a quick meal prep option for the week, or a dish to bring to a potluck, this casserole has everything you need—comfort, flavor, and balance.

Full Recipe

Ingredients

• 2 cups (400 g) cooked rice

• 1 large potato, peeled and diced

• 1 carrot, grated

• 1 zucchini, grated and squeezed of excess moisture

• 1 bell pepper, chopped

• 1 onion, finely chopped

• 2 cloves garlic, minced

• 1 cup (100 g) fresh spinach or kale, chopped

• 6 large eggs

• ½ cup (120 ml) milk

• 1 tsp salt

• ½ tsp black pepper

• 1 tsp dried Italian herbs (or oregano/basil mix)

• 1 cup (100 g) shredded mozzarella cheese

• 2 tbsp olive oil

For the Herb Mayo Sauce

• ½ cup (120 g) mayonnaise

• 1 tbsp lemon juice

• 1 tbsp fresh parsley, chopped

• 1 tbsp fresh dill, chopped

• 1 garlic clove, grated

• 1 pinch of black pepper

Cooking Directions

1. Preheat the oven to 180°C (350°F) and grease a medium-sized casserole dish with olive oil.

2. Prepare the vegetables by chopping the onion, grating the carrot and zucchini, dicing the potato, and chopping the spinach and bell pepper. Be sure to squeeze extra liquid from the zucchini so the casserole doesn’t turn watery.

3. In a skillet, heat olive oil and sauté the onion and garlic until fragrant. Add the potato, carrot, and bell pepper, cooking until slightly tender. Stir in the zucchini and spinach, then remove from heat.

4. In a large bowl, whisk together the eggs, milk, salt, pepper, and Italian herbs until smooth.

5. Add the cooked rice and sautéed vegetables into the egg mixture, stirring to combine.

6. Pour the mixture into the prepared casserole dish and spread evenly. Top generously with shredded mozzarella.

7. Bake uncovered for 30–35 minutes, until the top is golden and the center is set.

8. While the casserole bakes, prepare the herb mayo sauce by whisking together mayonnaise, lemon juice, parsley, dill, garlic, and pepper. Keep chilled until ready to serve.

9. Allow the casserole to cool for 5 minutes before slicing. Serve warm with the herb mayo sauce drizzled over or on the side.

Nutrients (per serving, approximate)

• Calories: 290

• Protein: 13 g

• Carbohydrates: 28 g

• Fat: 14 g

• Fiber: 3 g

• Calcium: 180 mg

• Iron: 2 mg

Why You’ll Love This Recipe

This casserole brings together the best of both worlds—comfort food and nutrition. You’ll love it because it’s budget-friendly, easy to prepare, and adaptable to whatever you have on hand. The combination of rice and eggs makes it filling, while the vegetables lighten it up and add freshness. The mozzarella on top is the irresistible finishing touch, creating a cheesy golden crust. To top it off, the herb mayo sauce balances richness with tangy, fresh flavors, making every bite memorable.

The Origins and Inspiration Behind the Dish

The concept of casseroles can be found in almost every cuisine, from French gratins to Middle Eastern baked rice dishes. This recipe takes inspiration from European rice bakes and Mediterranean flavors. Adding mozzarella and herb mayo is a modern twist that makes it feel familiar yet exciting. It’s the kind of dish that works equally well on a casual family table or as part of a festive spread.

Ingredient Spotlight

Rice is the backbone of this dish, providing substance and versatility. It absorbs the flavors of the vegetables and eggs while keeping the casserole hearty. Eggs act as a natural binder, giving the casserole structure while adding protein. Vegetables like zucchini, carrots, spinach, and peppers not only bring color but also a mix of vitamins and minerals. Mozzarella cheese adds a creamy, indulgent finish that melts beautifully in the oven. The herb mayo sauce deserves its spotlight too—it’s a simple blend, but the combination of lemon, dill, and parsley cuts through the richness and keeps the dish balanced.

Storage and Reheating Tips

This casserole is excellent for meal prepping and storing. You can refrigerate it in an airtight container for up to 4 days. To reheat, use the oven at 180°C (350°F) for about 10–12 minutes to maintain the texture. Avoid microwaving if you want to keep the top crispy. For longer storage, you can freeze slices individually by wrapping them in foil and placing them in freezer bags. When ready to eat, bake from frozen at 180°C (350°F) for about 20–25 minutes.

Common Variations to Try

One of the best things about this casserole is how easily it can be adapted. Swap rice for quinoa or couscous for a different grain base. Add crumbled feta, cheddar, or even gouda in place of mozzarella for a different cheesy flavor. You can mix in shredded chicken, ham, or sausage if you want extra protein. For a spicier twist, add chili flakes, jalapeños, or smoked paprika. If you’re looking for a lighter version, try replacing some rice with cauliflower rice for fewer carbs.

Pairing Recommendations

This casserole pairs beautifully with fresh, crisp side dishes. A green salad with lemon vinaigrette, cucumber and tomato salad, or roasted vegetables would complement the richness perfectly. For soups, a light tomato basil or vegetable broth makes a great companion. In terms of drinks, sparkling water with lemon, iced tea, or a chilled white wine pairs well, cutting through the creaminess of the casserole and mayo sauce.

Health Benefits

This dish may feel indulgent, but it’s packed with nutrients. Eggs bring high-quality protein and essential amino acids. Vegetables add fiber, vitamins A and C, potassium, and antioxidants. Rice provides complex carbohydrates for sustained energy. Spinach and zucchini in particular add iron and vitamin K, supporting healthy blood and bones. Even the herb mayo, while creamy, provides fresh herbs that are rich in antioxidants. Overall, it’s a balanced meal that’s both nourishing and satisfying.

Conclusion

The Baked Rice and Vegetable Egg Casserole with Mozzarella and Herb Mayo Sauce is proof that comfort food can be nutritious and versatile. It’s a dish you can prepare ahead, serve at gatherings, or enjoy as a simple family dinner. With its golden cheesy crust, hearty filling, and refreshing sauce, it delivers flavor in every bite. It adapts well to whatever ingredients you have on hand and provides plenty of room for creativity. Whether you’re a busy cook looking for a reliable meal prep recipe or someone who enjoys trying new twists on classic comfort food, this casserole deserves a place in your kitchen rotation.