Easy Zucchini Casserole 

By Rena |

If you like Zucchini then you are going to love this Zucchini casserole recipe. It is easy to make, very nutritious, and the perfect side dish recipe to serve all year round for any occasion.

top view zucchini casserole dish with wooden spoon in it

What a great way to add more veggies to your diet. There are so many different ways to use zucchini in meals, but this zucchini casserole is one of our favorite side dish recipes. The zucchinis are sliced and then partially roasted. The creamy parmesan sauce is then made with almond milk, garlic, cheese, and seasonings. The sauce is then poured over the zucchini laid out in the baking dish, topped with seasoned breadcrumbs, and then baked to perfection until ready to serve. Serve this zucchini casserole recipe as a side dish to literally any meal and it will pair perfectly. You can also easily make this vegetarian zucchini casserole vegan-friendly by using vegan or dairy-free cheese.

Why you will love this zucchini side dish recipe

  • Versatile: You can add any other veggie like mushrooms to your zucchini casserole. It pairs well with almost any meal.
  • Healthy: this vegetable casserole is packed with nutrition. Perfect way to serve up some veggies and they are low in carbs.
  • Easy to make: All the is done in the oven. You just need to make the sauce, assemble the dish and pop in the oven.
top view shot of zucchini casserole in a white dish

Ingredients, tips, and substitutes

  • Zucchini – we used green zucchini, but you may also use yellow zucchini or a mix of both.
  • Salt and pepper
  • Oil – any oil works. we used olive oil
  • Onion – white, sweet, or red onion will ne fine.
  • Garlic cloves– use fresh garlic cloves if you can. Garlic powder can be substited if in a pinch. use 1 tablspoon instead.
  • Milk: any milk you decide to go with works. We used almond milk.
  • Cornstarch: This makes the milk mixture thick. You can use flour instead but it would be more on the watery side.
  • Oregano: if you prefer to use another seasoning you like, go right ahead. Italian would be another good option.
  • Cheddar cheese: you can use light fat.
  • Parmesan cheese: shred your own or use store bought.
  • Bread Crumbs: use any bread crumbs you have. Seasoned will taste great with this zucchini casserole. Use gluten-free option if needed.
ingredients laid out to make zucchini casserole

How to make this Zucchini casserole from scratch

Preheat the oven to 425F.

Place the sliced zucchini in an oven-safe dish and season with salt and pepper.

Drizzle with 2 tablespoons of oil and toss well with your clean hands.

Bake for 10-12 minutes, or until the zucchini slightly softens.

creamy sauce being added over the sliced zucchini in a white dish

Heat the remaining tablespoon of oil in a medium saucepan over medium heat. Sauté the onion and garlic for 2-3 minutes.

Meanwhile, in a small bowl whisk the almond milk with cornstarch and oregano. 

Pour the milk mixture into the saucepan and simmer, stirring frequently for 3-4 minutes, or until sauce thickens to coat the back of the spoon. Stir in the parmesan cheese.

cheese added over the sliced zucchini before baking in a white dish

Remove the baking dish with the roasted zucchini from the oven. Drizzle with the garlic-parmesan sauce.

Sprinkle with cheese and breadcrumbs. Bake for 35-40 minutes or until squash is tender

top view zucchini casserole baked in a white dish

frequently asked questions

What exactly is a casserole?

Casseroles are a variety of foods that are ideal baked in a large or deep dish. The dish is referred to as a casserole dish, whereas the meal itself is simply called a casserole.

How long does zucchini last in the fridge?

If you store the zucchini properly, it will last for about 10-14 days. They are best when stored in a paper or plastic bag with enough air going through it and placed in the fridge.

Do you freeze zucchini raw?

It is not recommended to freeze raw zucchini because once thawed they will become mushy and watery. You may have to blanch zucchini first before freezing.

How to store zucchini casserole?

Store leftover zucchini casserole in a sealed container in the fridge for up to 4 days. We do not recommend freezing this zucchini casserole recipe.

wooden spoon on zucchini casserole dish

More recipe you may like

top view vegetarian zucchini casserole

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top view of zucchini casserole in a white dish

Easy Zucchini Casserole

Easy to make zucchini casserole made with green zucchini, a creamy garlic parmesan sauce mixture, topped with breadcrumbs and then baked to perfection. Ready in under an hour.
5 from 2 votes
Print Pin Rate
Course: Side Dish
Cuisine: American
Diet: Halal
Prep Time: 10 minutes
Cook Time: 45 minutes
Total Time: 55 minutes
Servings: 8
Calories: 138kcal
Author: Rena

Equipment

  • knife
  • cutting board
  • baking dish

Ingredients

  • 2 lb zucchini sliced
  • kosher salt and ground pepper to taste
  • 3 tbsp olive oil divided
  • 1 onion grated
  • 3-4 garlic cloves minced
  • 1 cup almond milk or 2% milk
  • 1 1/2 tbsp cornstarch
  • ½ tsp oregano
  • 1/4 cup finely grated parmesan cheese
  • 1/2 cup cheddar cheese
  • 1/4 cup seasoned bread crumbs

Instructions

  • Preheat the oven to 425F.
  • Place the sliced zucchini in an oven-safe dish and season with salt and pepper.
  • Drizzle with 2 tablespoons of oil and toss well with your clean hands. Bake for 10-12 minutes, or until the zucchini slightly softens.
  • Heat the remaining tablespoon of oil in a medium saucepan over medium heat. Sauté the onion and garlic for 2-3 minutes.
  • Meanwhile, in a small bowl whisk the almond milk with cornstarch and oregano.
  • Pour the milk mixture into the saucepan and simmer, stirring frequently for 3-4 minutes, or until sauce thickens to coat the back of the spoon. Stir in the parmesan cheese.
  • Remove the baking dish with the roasted zucchini from the oven. Drizzle with the garlic-parmesan sauce.
  • Sprinkle with cheese and breadcrumbs. Bake for 35-40 minutes or until squash is tender.
  • Serve and enjoy.

Notes

  • Serving size: one cup 
  • Veggies: you may add any other vegetable like mushrooms if you like.
  • Zucchini: we used only green, but you can add a mixture of green and yellow zucchini
  • Milk: almond milk was used. Feel free to use any other milk of choice. 
  • Use Gluten-free bread crumbs if needed.
  • Shred your own parmesan/cheese or you can use store-bought.

Nutrition

Calories: 138kcal | Carbohydrates: 10g | Protein: 5g | Fat: 9g | Saturated Fat: 3g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 5g | Cholesterol: 10mg | Sodium: 231mg | Potassium: 341mg | Fiber: 2g | Sugar: 4g | Vitamin A: 332IU | Vitamin C: 22mg | Calcium: 158mg | Iron: 1mg
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