Sunday Baked Vegetable Casserole

Name: Sunday Baked Vegetable Casserole
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Yield: 6 servings
Ingredients: 2 cups spinach, chopped; 1 cup bell peppers, diced; 1 cup zucchini, sliced; 1 cup cherry tomatoes, halved; 1 cup mushrooms, sliced; 1 cup broccoli florets; 2 tablespoons butter; 2 tablespoons flour; 2 cups milk; 1 cup cheddar cheese, shredded; 1 teaspoon garlic powder; Salt and pepper to taste; 1 cup breadcrumbs; 1/2 cup Parmesan cheese, grated; 2 tablespoons olive oil; 1 teaspoon Italian seasoning

Highlighted under: Comfort Food

I absolutely love preparing this Sunday Baked Vegetable Casserole as a delightful way to celebrate the weekend. The vibrant colors and hearty flavors come together beautifully, making it perfect for family gatherings or a comforting meal at home. The mix of seasonal vegetables gives it that fresh taste, while the layering technique ensures every bite is packed with goodness. Assembling it is a fun activity, and it makes the house smell heavenly while baking. I can't wait for you to try this recipe!

Created by

Margaret Hill

Last updated on 2026-01-13T22:25:16.413Z

When I first decided to make this casserole, I was looking for a way to use up some of the fresh vegetables in my fridge. I combined them with a homemade cheese sauce, and the result was incredible! Each vegetable retains its identity while harmonizing with the others, creating a dish that is both satisfying and nourishing. The key is to layer the vegetables thoughtfully to ensure even cooking and a nice balance of textures.

Over the years, I've added a sprinkle of fresh herbs just before serving, which elevates the dish even more. I recommend using seasonal vegetables for the best flavor; not only does it make the casserole more vibrant, but it also maximizes freshness. Pairing it with crusty bread makes a perfect Sunday lunch!

        Why You'll Love This Casserole
        A colorful presentation that looks amazing on any table
Packed with a variety of nutrients from fresh vegetables
Versatile recipe that allows for endless combinations of ingredients

      

The Importance of Layering

Layering your vegetables not only ensures even cooking but also allows for a delightful mix of textures in each bite of the casserole. Starting with leafy greens like spinach helps to create a moisture barrier, which prevents the dish from becoming too watery, especially when baking. Make sure to pack your vegetables tightly yet evenly so they soften perfectly and infuse their flavors into the cheese sauce.

When layering the bell peppers and zucchini, consider cutting them uniformly to promote consistent cooking. This will help them soften at the same rate, avoiding any raw spots. A mix of textures from soft and crunchy vegetables will elevate your casserole experience, making each forkful a satisfying treat.

Cheese Sauce Tips

The cheese sauce is the heart of this casserole, providing both creaminess and flavor. When preparing the sauce, it's crucial to whisk continuously after adding the milk to avoid lumps. Cook the mixture until it is glossy and thickened, which usually takes about 5-7 minutes. This ensures your cheese melts smoothly into the sauce instead of clumping together.

If you're looking to lighten the dish, consider using a blend of low-fat cheese and a non-dairy milk alternative. Just be mindful that non-dairy options can vary in thickness, so choose one that mimics the creaminess of whole milk for the best results. A splash of white wine can also enhance the flavor profile of your cheese sauce, adding depth to the overall dish.

Serving and Storing

Letting the casserole cool for a few minutes after baking allows the layers to set, making it easier to serve without falling apart. Pair it with a crusty whole-grain bread to soak up any extra cheese sauce. This dish can also be a fantastic side alongside grilled meats or a simple salad for a complete meal.

For leftovers, store the casserole in an airtight container in the refrigerator for up to three days. It reheats beautifully in the oven at 350°F (175°C) for about 15-20 minutes or until heated through. Freezing is also an option; just be sure to wrap it tightly to avoid freezer burn. When ready to enjoy, thaw overnight in the fridge and reheat as described.

Ingredients

Gather these fresh ingredients to make your Sunday Baked Vegetable Casserole:

Vegetable Medley

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

Cheese Sauce

2 tablespoons butter
2 tablespoons flour
2 cups milk
1 cup cheddar cheese, shredded
1 teaspoon garlic powder
Salt and pepper to taste

Topping

1 cup breadcrumbs
1/2 cup Parmesan cheese, grated
2 tablespoons olive oil
1 teaspoon Italian seasoning

Once you have all these ingredients, you're ready to create a delicious casserole!

Instructions

Follow these simple steps to prepare your casserole:

Prepare the Cheese Sauce

In a medium saucepan, melt butter over medium heat. Stir in flour and cook for 1 minute. Gradually whisk in milk, cooking until thickened. Remove from heat and mix in cheddar cheese, garlic powder, salt, and pepper.

Layer the Vegetables

In a greased 9x13 inch baking dish, layer the chopped vegetables as follows: spinach, bell peppers, zucchini, mushrooms, broccoli, and cherry tomatoes. Pour the cheese sauce evenly over the layered vegetables.

Add the Topping

In a bowl, combine breadcrumbs, Parmesan cheese, olive oil, and Italian seasoning. Mix well and sprinkle evenly over the casserole.

Bake

Preheat the oven to 350°F (175°C). Bake the casserole for about 40 minutes, or until the top is golden brown and the vegetables are tender.

Serve

Let the casserole cool for 5 minutes before serving. Enjoy with your favorite bread or as a stand-alone dish!

Once out of the oven, enjoy the wonderful aromas that fill your kitchen!

Pro Tips

For added flavor, try including roasted garlic or fresh herbs in the cheese sauce. You can also substitute vegetables based on what's seasonal or available in your kitchen for a custom casserole.

Make-Ahead Options

This casserole is an ideal candidate for make-ahead meals. You can prepare and assemble the entire dish a day in advance, then store it in the fridge before baking. Allow it to come to room temperature for about 30 minutes before placing it in the oven; this ensures even cooking throughout the casserole.

To save time on busy weekends, you can also pre-chop your vegetables and store them in air-tight containers. Consider steaming some vegetables lightly before layering to enhance their flavors and textures, ensuring they maintain their vibrant color during the baking process.

Variations to Try

Feel free to switch up the vegetables based on what’s in season or what you prefer. For instance, try incorporating asparagus or carrots for added crunch. If you're a fan of spicy flavors, consider adding diced jalapeños or a sprinkle of crushed red pepper to the cheese sauce for a zesty kick.

For a protein boost, consider layering in cooked quinoa or adding beans, such as black beans or chickpeas. These ingredients not only enhance the nutrition profile but also add a hearty component that makes the casserole more filling and satisfying.

Questions About Recipes

→ Can I make this casserole ahead of time?

Yes! You can assemble the casserole a day in advance. Just cover it tightly and store it in the refrigerator. Bake it on the day you plan to serve it.

→ What other vegetables work well in this recipe?

You can add vegetables like carrots, green beans, or sweet potatoes. Just make sure to chop them evenly for uniform cooking.

→ Can I use a different type of cheese?

Absolutely! Feel free to experiment with mozzarella, gouda, or even a dairy-free cheese substitute if you're looking to make it vegan.

→ How do I store leftovers?

Store any leftovers in an airtight container in the fridge for up to 3 days. You can reheat it in the oven or microwave until warmed through.