This cheesy zucchini squash casserole is a warm and comforting dish that’s easy to whip up. Packed with tender zucchini, rich cheese, and tasty spices, it’s a veggie lover’s delight!
I always find it hard to resist a cheesy meal, especially when it includes veggies! I like to serve it with some crispy bread on the side for a hearty dinner.
Key Ingredients & Substitutions
Zucchini and Yellow Squash: Both are key for this casserole, providing the main flavor and texture. If you can’t find fresh ones, frozen shredded zucchini and squash work in a pinch; just thaw and drain them well before using.
Cheddar Cheese: Sharp cheddar adds a nice kick, but you can use mild or even a mix of cheeses like Monterey Jack for a milder taste. For a dairy-free option, try a cashew or almond-based cheese alternative.
Mayonnaise and Sour Cream: These give creaminess to the dish. You can swap mayonnaise for Greek yogurt or vegan mayo for a healthier or dairy-free option.
Onion and Garlic: Essential for flavor! You could use shallots or even a pinch of onion powder and garlic powder as alternatives if fresh ingredients are not available.
How Do I Prevent a Watery Casserole?
A watery casserole can ruin the dish, so follow these steps to ensure it stays firm. First, salting the shredded zucchini and squash draws moisture out. After resting for 10 minutes, make sure to squeeze out as much liquid as possible using a kitchen towel.
- Place shredded zucchini and squash in a colander and sprinkle with salt.
- Let them sit for 10 minutes, then squeeze them out.
This method keeps the texture creamy but not soupy, ensuring the flavors shine through in every bite.
What’s the Best Way to Layer My Casserole?
For even cooking and flavor distribution, it’s important to layer the ingredients well. Mix the drained zucchini and squash thoroughly with the other ingredients, then spread evenly into the greased casserole dish.
- Pour the mixture into the dish, spreading to the corners for even cooking.
- Top with cheese just before baking for a delicious, melted crust.
Following these tips will help you achieve a perfectly baked casserole, with everyone coming back for seconds!
How to Make Cheesy Zucchini Squash Casserole
Ingredients You’ll Need:
For the Casserole:
- 4 cups shredded zucchini (about 2 medium zucchinis)
- 4 cups shredded yellow squash (about 2 medium squash)
- 1 small onion, thinly sliced
- 2 cloves garlic, minced
- 1 ½ cups shredded sharp cheddar cheese
- 1 cup grated Parmesan cheese
- 1 cup sour cream
- 1 cup mayonnaise
- 3 large eggs, beaten
- 1 teaspoon salt
- ½ teaspoon black pepper
- 1 teaspoon dried parsley (plus extra for garnish)
- 1 teaspoon dried thyme or Italian seasoning
- 2 tablespoons olive oil or butter (for sautéing)
- Non-stick cooking spray or butter (for greasing casserole dish)
How Much Time Will You Need?
This cheesy zucchini squash casserole takes about 15 minutes of prep time and then around 45-50 minutes to bake. After baking, let it cool for about 10 minutes before serving. So, in total, you’re looking at about 1 hour and 15 minutes from start to finish.
Step-by-Step Instructions:
1. Prepare the Oven and Dish:
Start by preheating your oven to 350°F (175°C). While waiting, lightly grease a 9×13-inch casserole dish with either non-stick cooking spray or a bit of butter so the casserole doesn’t stick.
2. Drain the Vegetables:
Take the shredded zucchini and yellow squash and place them in a large colander. Lightly sprinkle them with salt and let them rest for about 10 minutes. This will help draw out all the extra moisture. Once time’s up, take a clean kitchen towel or some cheesecloth and squeeze out as much liquid as you can. This step is super important to keep your casserole from getting watery!
3. Sauté Onions and Garlic:
In a large skillet, heat up 2 tablespoons of olive oil or butter over medium heat. Add in the sliced onion and cook for about 3-4 minutes or until it’s softened. Then, toss in the minced garlic and cook for another minute until it’s nice and fragrant. Remove the skillet from heat and allow it to cool down a bit.
4. Mix the Ingredients:
In a big mixing bowl, combine the drained shredded zucchini and squash with the cooked onions and garlic. Then, add in the sour cream, mayonnaise, beaten eggs, Parmesan cheese, 1 cup of the shredded cheddar cheese, salt, black pepper, dried parsley, and thyme. Stir everything together until it’s well mixed.
5. Assemble the Casserole:
Pour the mixture into your prepared casserole dish, spreading it out evenly to fill every corner. Then, sprinkle the remaining ½ cup of shredded cheddar cheese on top, creating a lovely cheesy crust.
6. Bake to Perfection:
Place the casserole in the oven and bake uncovered for about 45-50 minutes. You’ll know it’s ready when it’s set, bubbly, and has a beautiful golden brown color on top.
7. Rest and Serve:
Once it’s done, take the casserole out of the oven and let it sit for about 10 minutes. This helps it hold its shape when you cut it into squares. Before serving, feel free to garnish it with a sprinkle of dried parsley or fresh parsley for a nice touch.
8. Enjoy!
Serve warm as a comforting side dish or a vegetarian main. Your friends and family will love this cheesy delight!
Enjoy this deliciously cheesy zucchini squash casserole, perfect for any meal!
FAQ for Cheesy Zucchini Squash Casserole
Can I Use Other Vegetables in This Casserole?
Absolutely! Feel free to mix in or substitute other vegetables like bell peppers, mushrooms, or spinach for added flavor and nutrition. Just make sure to finely chop and sauté them with the onion and garlic.
How Do I Store Leftovers?
Store any leftovers in an airtight container in the fridge for up to 3-4 days. Just reheat gently in the microwave or oven until warmed through. It also freezes well for up to 3 months; just thaw in the fridge before reheating.
Can I Make This Casserole Ahead of Time?
Yes! You can assemble the casserole in advance, cover it, and refrigerate it for up to 24 hours before baking. Just be sure to add a few extra minutes to the baking time if it goes in the oven cold.
What Can I Serve with This Casserole?
This casserole pairs well with a simple side salad or some crusty bread. It also makes a great vegetarian main dish for a family dinner or potluck!
