Sunday Baked Vegetable Casserole

Name: Sunday Baked Vegetable Casserole
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Yield: 8 servings
Ingredients: 2 cups chopped broccoli; 1 cup diced bell peppers; 1 cup sliced zucchini; 1 cup cherry tomatoes, halved; 1 cup diced onions; 2 cups spinach leaves; 2 cups shredded mozzarella cheese; 1 cup grated Parmesan cheese; 1 cup breadcrumbs; 2 tablespoons olive oil; Salt and pepper to taste; 1 teaspoon Italian seasoning

Highlighted under: Baking & Desserts

I absolutely adore this Sunday Baked Vegetable Casserole! It’s become a cherished family tradition for my weekend brunches. The vibrant colors of the vegetables and the delightful aroma wafting through the kitchen always make my mouth water. It’s packed with delicious seasonal vegetables layered between creamy cheese and a crunchy topping, making it both hearty and satisfying. This dish has quickly become a favorite, and I love how versatile it is for any occasion. Let’s dive into the recipe and make your Sundays a little brighter!

Created by

Clara Jennings

Last updated on 2026-01-13T19:37:19.671Z

When I first made this casserole, I used whatever vegetables I had in the fridge, and it turned out to be a delightful mistake! I learned that each vegetable contributes its unique flavor, making every bite a new experience. It’s a great way to get a variety of nutrients while indulging in comfort food.

The key to achieving the perfect texture is to layer the vegetables correctly and let them bake just long enough to meld together without becoming mushy. I recommend using a mix of seasonal greens and root vegetables for that perfect balance of flavor and texture.

        Why You’ll Love This Recipe
        Packed with nutritious and colorful vegetables
Creamy cheese that adds a rich depth of flavor
Perfect for meal prep and leftovers

      

Choosing the Right Vegetables

For this casserole, selecting the freshest seasonal vegetables enhances flavor and texture. Broccoli, bell peppers, zucchini, and cherry tomatoes not only contribute vibrant colors but also a range of nutrients. Aim for a balance of textures; the crispness of fresh broccoli and bell peppers complements the creaminess of the cheese. If you prefer other veggies like asparagus or carrots, feel free to substitute while keeping the quantities similar to ensure even cooking.

Incorporate vegetables based on personal preference or seasonal availability. For instance, replace zucchini with summer squash or add in sautéed mushrooms for an earthy flavor. Such substitutions can keep the dish exciting and cater to varying tastes within the family.

Layering for Flavor

When assembling your casserole, layering is key to ensuring every bite is flavorful. Starting with a layer of sautéed vegetables followed by mozzarella creates a luscious base. This method helps to lock in moisture and flavor as it bakes. For added depth, consider scattering some herbs or a sprinkle of garlic powder between layers. This small step can elevate the overall taste significantly.

As you layer, think about color, too. Alternating between colorful vegetables and cheese not only makes for an appealing presentation but also allows the flavors to meld beautifully. Each vegetable brings its unique taste, contributing to a more complex and satisfying dish.

Perfecting the Casserole Topping

The topping in this casserole creates a delightful contrast to the creamy layers beneath. When mixing the breadcrumbs, cheese, olive oil, and seasonings, ensure the breadcrumbs are evenly coated for a consistent texture. This step is essential; unevenly mixed toppings can lead to some parts being dry and others overly greasy. A good rule of thumb is to aim for a mixture that resembles wet sand, allowing it to crisp up perfectly in the oven.

If you're looking for an alternative to traditional breadcrumbs, consider using crushed crackers or panko for a lighter, crunchier texture. Both options will still achieve that golden brown finish, while offering a unique take on the classic casserole topping.

Ingredients

Gather these fresh ingredients to create a memorable Sunday dish:

Vegetables

2 cups chopped broccoli
1 cup diced bell peppers
1 cup sliced zucchini
1 cup cherry tomatoes, halved
1 cup diced onions
2 cups spinach leaves

Casserole Topping

2 cups shredded mozzarella cheese
1 cup grated Parmesan cheese
1 cup breadcrumbs
2 tablespoons olive oil
Salt and pepper to taste
1 teaspoon Italian seasoning

Once you have all the ingredients, we can proceed to the next steps in creating this fabulous casserole.

Instructions

Follow these simple steps to bring this casserole to life:

Preheat the oven

Preheat your oven to 375°F (190°C) to ensure it’s hot before placing the casserole inside.

Prepare the vegetables

In a large skillet, sauté the onions until translucent. Add the broccoli, zucchini, and bell peppers, cooking for about 5 minutes, until slightly tender. Stir in the spinach leaves until wilted.

Assemble the casserole

In a greased baking dish, layer half of the sautéed vegetables, followed by a layer of mozzarella cheese. Repeat with the remaining vegetables and cheese.

Add topping

In a bowl, mix the breadcrumbs, Parmesan cheese, olive oil, Italian seasoning, salt, and pepper. Sprinkle this mixture evenly over the casserole.

Bake

Cover the dish with foil and bake for 25 minutes. Remove the foil and bake for an additional 15 minutes or until the top is golden brown and bubbling.

Serve

Let it cool for a few minutes before serving. Enjoy your colorful casserole with family and friends!

Now that you've combined the ingredients and followed the steps, you’ll have a fantastic casserole to enjoy!

Pro Tips

For added flavor, try using fresh herbs like basil or thyme in place of Italian seasoning. You can also customize the vegetables based on what you have available.

Make-Ahead and Storage Tips

This baked vegetable casserole is perfect for meal prep! You can fully assemble it a day in advance, store it covered in the fridge, and bake it fresh when you're ready to serve. This not only saves time but also allows the flavors to meld, enhancing the overall taste. If you choose to prep ahead, reduce the baking time by 5-10 minutes, monitoring for that golden bubbly top.

For longer storage, consider freezing an unbaked casserole. Wrap it tightly with foil or plastic wrap, and it can be kept for up to three months. When you're ready to bake, no need to thaw; just increase the baking time by about 10-15 minutes. Always check with a toothpick or knife to ensure it’s heated through.

Serving Suggestions

This colorful casserole can stand alone or be served alongside a fresh garden salad for a light meal. You might also consider pairing it with some crusty bread or savory muffins, which could elevate the brunch experience. A drizzle of balsamic reduction on top just before serving adds an extra layer of flavor that many guests will appreciate.

Feel free to experiment with serving sizes as well. This recipe can easily be doubled or halved based on your needs. Just remember to adjust your baking dish size accordingly; a larger dish may require slight adjustments in cooking time and temperature to ensure even cooking.

Questions About Recipes

→ Can I use frozen vegetables?

Yes, you can use frozen vegetables, but reduce the sauté time as they are often pre-cooked.

→ How do I store leftovers?

Store leftovers in an airtight container in the refrigerator for up to 3 days, or freeze for longer storage.

→ Can I make this casserole ahead of time?

Absolutely! Prepare it up until the baking step, refrigerate overnight, then bake when you're ready.

→ Is this recipe vegetarian?

Yes, this casserole is vegetarian and can be made vegan by using plant-based cheese and breadcrumbs.