Sunday Baked Vegetable Casserole

Name: Sunday Baked Vegetable Casserole
Prep time: 20 min
Cook time: 45 min
Total time: 1 h 5 min
Yield: 6 servings
Ingredients: 2 cups chopped zucchini; 2 cups diced bell peppers; 1 cup chopped spinach; 1 cup sliced mushrooms; 1 medium onion, diced; 2 cloves garlic, minced; 2 cups cooked quinoa or rice; 1 can diced tomatoes, drained; 1 cup shredded mozzarella cheese; 1 cup ricotta cheese; 2 large eggs; 1 teaspoon dried Italian herbs; Salt and pepper to taste

Highlighted under: Baking & Desserts

I love to spend my Sundays preparing a hearty and wholesome dish, and this Sunday Baked Vegetable Casserole has become a family favorite. It’s a comforting mix of vibrant vegetables, layered with rich flavors and baked to perfection. The best part is that it’s incredibly easy to whip up, making it the perfect addition to our Sunday gatherings. Each bite is bursting with seasonal goodness, and it always leaves everyone asking for seconds. Trust me, this casserole is both satisfying and nutritious, making it a true crowd-pleaser!

Created by

Paige Sullivan

Last updated on 2026-01-13T19:55:20.588Z

As I was experimenting with vegetable recipes, I found that layering the ingredients truly enhances the flavors. I usually start with a base of sautéed onions and garlic to create a savory foundation that carries the entire dish. Adding a variety of colorful vegetables not only makes it visually appealing but also provides a different texture in every bite. It's a delicious way to enjoy fresh produce!

The magic really happens while baking. I found that covering the casserole for the first half of cooking traps the steam, ensuring everything cooks evenly. Once uncovered, that beautiful golden top creates a delightful crunch. It’s a dish that impresses, yet is simple enough for a casual Sunday meal.

        Why You'll Love This Recipe
        A delightful mix of seasonal vegetables packed with nutrients.
Comforting layers of flavor that make each bite a treat.
Perfect for meal prepping and leftovers that taste even better.

      

Understanding the Layers

Creating layers in your casserole not only helps with texture but also allows the flavors to meld beautifully. When layering, it’s essential to ensure that the vegetables are evenly distributed throughout the dish. This balance prevents any one layer from becoming too soggy. If you prefer a crunchier texture, consider lightly roasting your veggies before adding them to the mix. This simple adjustment can elevate the overall dish, giving it a toasted flavor that complements the creamy cheeses wonderfully.

For a more pronounced flavor profile, think about introducing alternative herbs and spices to the mix. While Italian herbs are a classic choice, adding a pinch of smoked paprika or even a dash of cayenne can enhance the depth of flavor and make the dish more exciting. Be mindful, though, to not overpower the delicate taste of the vegetables—enhancing rather than overshadowing is key!

Ingredient Substitutions and Variations

If you have specific dietary needs or simply want to switch things up, this casserole is versatile enough to accommodate various ingredients. For example, if you are avoiding gluten, substitute quinoa for any rice option. Additionally, for a vegan version, consider using chickpea flour mixed with water as an egg replacement and swap out the cheeses for a plant-based equivalent. Nutritional yeast can provide a cheesy flavor without dairy, making it a great option for those with lactose intolerance.

Seasonal adaptations can keep this dish fresh and interesting. In the fall, try incorporating roasted butternut squash or brussels sprouts, while spring could feature fresh asparagus or artichokes. When choosing ingredients, always aim for what’s in season—they're typically more flavorful and nutrient-packed. This dish is all about celebrating the vibrancy of vegetables, so don’t hesitate to experiment!

Storing and Reheating Tips

One of the best aspects of the Sunday Baked Vegetable Casserole is its ability to taste even better the next day. To store leftovers, simply cover the casserole tightly with plastic wrap or aluminum foil once it has cooled. It can be stored in the refrigerator for up to 3–5 days. If you're looking to make this dish ahead of time, feel free to assemble everything and refrigerate it uncooked. Just extend the cooking time by about 10 minutes if baking it straight from the fridge.

When reheating, consider using an oven for the best results. Preheat to 350°F (175°C) and bake for about 15-20 minutes until warmed through and the cheese is melted again. Microwave reheating is quicker but may lead to a slightly soggy texture, so use this method only if you’re in a hurry. This casserole keeps its integrity well, making it ideal for meal prepping!

Ingredients

To prepare this delicious casserole, gather the following ingredients:

Vegetables

2 cups chopped zucchini
2 cups diced bell peppers
1 cup chopped spinach
1 cup sliced mushrooms
1 medium onion, diced
2 cloves garlic, minced

Casserole Base

2 cups cooked quinoa or rice
1 can diced tomatoes, drained
1 cup shredded mozzarella cheese
1 cup ricotta cheese
2 large eggs
1 teaspoon dried Italian herbs
Salt and pepper to taste

Combine all ingredients in a large bowl for a richly flavored casserole.

Instructions

Here's how to make your Sunday Baked Vegetable Casserole:

Preheat the Oven

Preheat your oven to 375°F (190°C). Grease a 9x13-inch baking dish.

Sauté the Vegetables

In a large skillet, sauté the onion and garlic until fragrant, then add the zucchini, bell peppers, mushrooms, and spinach. Cook until softened, about 5-7 minutes.

Mix the Casserole Base

In a large mixing bowl, combine the cooked quinoa or rice, sautéed vegetables, diced tomatoes, ricotta cheese, eggs, and seasonings. Stir until well combined.

Layer the Casserole

Pour half of the mixture into the greased baking dish, sprinkle half of the mozzarella cheese, then add the remaining mixture followed by the rest of the cheese on top.

Bake

Cover with foil and bake for 30 minutes. Remove the foil and bake for an additional 15 minutes, or until golden on top.

Allow the casserole to rest for a few minutes before serving to let the layers set.

Pro Tips

Feel free to customize with any vegetables you have on hand or prefer. You can also use different types of cheese for added flavor!

Serving Suggestions

This casserole pairs beautifully with a crisp garden salad dressed in a simple lemon vinaigrette. The freshness of the salad balances the richness of the baked dish, creating a well-rounded meal. Alternatively, serve it as a side dish alongside grilled chicken or roasted fish for a heartier gathering. The casserole is versatile enough to complement various proteins without overpowering them.

For a family-style serving, I recommend cutting the casserole into squares and plating it directly from the baking dish for a rustic touch. A sprinkle of fresh herbs like basil or parsley on top just before serving can brighten the presentation and add a fresh note to the dish. It’s these simple touches that can elevate your mealtime!

Troubleshooting Common Issues

If you find that the casserole is too watery after baking, this could be due to excess moisture from the vegetables. To combat this, ensure you sauté the vegetables until they’re nicely softened and any extra liquid has evaporated. Pre-cooking your vegetables helps maintain the ideal balance of moisture content, essential for a perfect casserole consistency.

A common concern is achieving the right amount of cheese melting and browning on top. If your casserole never achieves that beautiful golden finish, make sure to bake without foil in the final 15 minutes and keep an eye on the temperature. If you notice it browning too quickly, you can loosely cover it with foil to prevent burning while ensuring the insides cook through spot-on.

Questions About Recipes

→ Can I make this casserole ahead of time?

Absolutely! You can prepare it a day in advance and bake it when you're ready to serve.

→ Is it possible to freeze the casserole?

Yes, just let it cool completely before wrapping and freezing. Thaw in the fridge overnight before reheating.

→ What is a good side dish to serve with this casserole?

A simple green salad or crusty bread pairs perfectly with the casserole.

→ Can I substitute quinoa with something else?

Yes, you can use cooked rice, couscous, or even lentils as alternatives.