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 of chopped zucchini; 2 cups of diced bell peppers (mixed colors); 1 cup of broccoli florets; 1 cup of chopped carrots; 1 cup of cherry tomatoes, halved; 1 medium onion, diced; 3 cloves of garlic, minced; 2 cups of shredded mozzarella cheese; 1 cup of grated parmesan cheese; 1 teaspoon dried oregano; 1 teaspoon dried basil; Salt and pepper to taste; 2 tablespoons olive oil

Highlighted under: Comfort Food

I absolutely love making this Sunday Baked Vegetable Casserole for our family gatherings. It’s a dish that not only showcases a vibrant assortment of seasonal veggies, but also brings everyone together around the table for a delicious meal. As we layer the vegetables and cheese, the anticipation builds for that moment when we pull it out of the oven, revealing a bubbling, golden masterpiece. Plus, it’s an excellent way to sneak in some healthy options without anyone even noticing!

Created by

Cassidy Moore

Last updated on 2026-01-13T21:19:17.634Z

When I first tried making a vegetable casserole, I was surprised by how versatile it could be. By incorporating a variety of seasonal vegetables, I not only highlighted their natural flavors but also created a colorful dish that garners compliments every time. The secret? Roasting the vegetables before layering them enhances their taste dramatically, transforming simple ingredients into something extraordinary.

As I developed this recipe, I experimented with different cheeses and seasonings. The combination of mozzarella and parmesan gives the casserole a creamy, rich texture, while the addition of fresh herbs brightens the overall flavor. Trust me, once you try it this way, you won’t want to go back!

        Why You'll Love This Recipe
        A colorful medley of seasonal vegetables bursting with flavor.
Creamy, cheesy layers that create a satisfying texture.
A great way to make vegetables the star of your plate.

      

Choosing Your Vegetables

The beauty of this casserole lies in its versatility when it comes to vegetables. While the recipe calls for traditional veggies like zucchini and bell peppers, don’t hesitate to experiment with your favorites. Seasonal vegetables such as asparagus, spinach, or even artichoke hearts can bring an exciting twist. If you opt for sturdier vegetables like sweet potatoes or butternut squash, remember to roast them longer to ensure they are tender by the time you assemble the casserole.

In this dish, freshness is key. Look for vibrant, crisp vegetables at your local market, as they will not only enhance the flavor but also contribute to a more visually appealing casserole. For a deeper flavor, consider sautéing your onions and garlic in the olive oil before adding the other vegetables. This step builds a flavorful base that permeates the entire dish.

Storing and Reheating

If you have leftovers, they can be stored in the refrigerator for up to four days, making this casserole a great option for meal prep. Simply cover it tightly with plastic wrap or transfer individual portions to airtight containers. To refresh the dish, reheat in the microwave or oven. For oven reheating, cover with foil to prevent over-browning and heat at 350°F (175°C) for about 15-20 minutes or until warmed through.

For a longer shelf life, you can freeze this casserole. Freeze it before baking for best results. Assemble the layers in a freezer-safe dish, wrap it tightly, and store. When you're ready to enjoy it, thaw overnight in the fridge before baking. Keep in mind that cooking times may need to be extended by about 10-15 minutes if baking straight from the freezer.

Ingredients

Gather these fresh ingredients to create the perfect casserole:

Casserole Ingredients

2 cups of chopped zucchini
2 cups of diced bell peppers (mixed colors)
1 cup of broccoli florets
1 cup of chopped carrots
1 cup of cherry tomatoes, halved
1 medium onion, diced
3 cloves of garlic, minced
2 cups of shredded mozzarella cheese
1 cup of grated parmesan cheese
1 teaspoon dried oregano
1 teaspoon dried basil
Salt and pepper to taste
2 tablespoons olive oil

Mix and match your favorite vegetables to make it your own!

Instructions

Follow these steps to create your Sunday Baked Vegetable Casserole:

Preheat the Oven

Preheat your oven to 375°F (190°C) to ensure even cooking.

Prepare the Vegetables

In a large bowl, combine the zucchini, bell peppers, broccoli, carrots, tomatoes, onion, and garlic. Drizzle with olive oil, and sprinkle in the oregano, basil, salt, and pepper. Toss everything together until the vegetables are well coated.

Roast the Vegetables

Spread the vegetables onto a baking sheet in a single layer and roast in the oven for about 20 minutes, until tender.

Layer the Casserole

In a greased 9x13 inch baking dish, layer half of the roasted vegetables, followed by half of the mozzarella and parmesan. Repeat with the remaining vegetables and cheese.

Bake the Casserole

Cover the baking dish with foil and bake for 25 minutes. Remove the foil and bake for another 20 minutes or until the cheese is bubbly and golden brown.

Serve and Enjoy

Let the casserole cool for a few minutes before serving. Enjoy your delicious and healthy Sunday Baked Vegetable Casserole!

Serve hot, accompanied by a fresh salad for a complete meal!

Pro Tips

Experiment with different herbs and cheese types for a personalized touch to your casserole.

Creating Flavor Depth

To elevate the flavor profile of your Sunday Baked Vegetable Casserole, consider adding a splash of balsamic vinegar or lemon juice to the roasted vegetables for brightness. You could also experiment with different herbs, such as thyme or rosemary, which would provide a fragrant touch that pairs beautifully with the cheese. Remember, the cheese itself adds richness, so balancing it with slight acidity will create a well-rounded dish.

Another delightful twist is to mix different types of cheese. Instead of just mozzarella and parmesan, try adding some sharp cheddar or creamy goat cheese. Each type contributes unique textures and flavors. Don’t forget; the cheeses should be distributed evenly throughout the layers to provide that melty goodness in every bite.

Serving Suggestions

This casserole can be a hearty main dish or a delightful side. Pair it with a simple green salad drizzled with a vinaigrette to cut through the creaminess. For a special occasion, serve alongside crusty bread for dipping into the cheesy layers. A light soup, like tomato or minestrone, could complement the casserole beautifully, making it a well-rounded meal.

If you’re feeling adventurous, consider adding a layer of cooked quinoa or brown rice in the casserole for added texture and nutrition. This will not only make the dish more filling but also introduce a nutty flavor that harmonizes with the vegetables and cheese, providing more complexity in every bite.

Questions About Recipes

→ Can I use frozen vegetables instead of fresh?

Yes, you can use frozen vegetables, but be sure to thaw and drain them to prevent excess moisture in the casserole.

→ How can I make this dish vegan?

Substitute the cheese with vegan cheese or nutritional yeast, and use a plant-based oil.

→ Can I prepare this casserole in advance?

Absolutely! You can prepare it a day ahead and keep it in the fridge until you’re ready to bake.

→ What is the best way to store leftovers?

Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat in the oven for the best quality.