This Cheesy Zucchini Gratin transforms simple zucchini into a warm, creamy, comforting side dish with tender zucchini, a rich garlic cream sauce, and a golden, bubbly cheese topping. Perfect for family dinners, holidays, potlucks, or whenever you need an easy vegetable side dish!
Prep Time: 15 minutes
Cook Time: 30–35 minutes
Total Time: About 45–50 minutes
Servings: 6
Ingredients
For the Zucchini
4 medium zucchini, sliced into thin rounds
1 tablespoon olive oil or butter
2 cloves garlic, minced
½ teaspoon salt
½ teaspoon black pepper
½ teaspoon Italian seasoning or dried thyme
For the Creamy Sauce
1 tablespoon butter
1 tablespoon all-purpose flour
1 cup milk
½ cup heavy cream
¼ teaspoon garlic powder
¼ teaspoon onion powder
Salt and black pepper, to taste
For the Cheesy Topping
1 cup shredded mozzarella cheese
½ cup grated Parmesan cheese
¼ cup breadcrumbs, optional for extra crunch
1 tablespoon melted butter, optional
Fresh thyme or parsley, for garnish
Instructions
1. Prepare the zucchini
Preheat your oven to 400°F (200°C). Lightly grease a medium baking dish.
Wash the zucchini and slice it into thin, even rounds. Arrange the slices in the prepared baking dish, slightly overlapping them.
2. Season
Drizzle the zucchini with olive oil or melted butter. Sprinkle with minced garlic, salt, black pepper, and Italian seasoning.
3. Make the creamy sauce
In a saucepan over medium heat, melt 1 tablespoon butter. Whisk in the flour and cook for about 1 minute.
Slowly pour in the milk while whisking continuously. Add the heavy cream, garlic powder, onion powder, salt, and pepper.
Cook for 3–5 minutes, stirring frequently, until the sauce thickens slightly.
4. Assemble the gratin
Pour the creamy sauce evenly over the zucchini.
Sprinkle the mozzarella and Parmesan cheese over the top.
For a crunchy topping, combine the breadcrumbs with melted butter and sprinkle over the cheese.
5. Bake
Cover loosely with foil and bake for 20 minutes.
Remove the foil and continue baking for another 10–15 minutes, or until the zucchini is tender and the cheese is golden and bubbly.
6. Rest and serve
Allow the gratin to rest for 5–10 minutes before serving. Garnish with fresh thyme or parsley if desired.
Serve warm and enjoy!
Nut Information & Allergy Guide
Does this recipe contain nuts?
No. This recipe contains no peanuts or tree nuts as written.
However, if you are preparing this dish for someone with a severe peanut or tree-nut allergy, always check the labels of packaged ingredients for possible cross-contact.
Ingredients to check:
Shredded mozzarella
Parmesan cheese
Breadcrumbs
Milk or cream products
Butter
Italian seasoning blends
Some commercially packaged foods may be processed in facilities that also handle peanuts or tree nuts.
Common allergen information
Milk/Dairy: Contains butter, milk, cream, mozzarella, and Parmesan.
Gluten: Contains gluten if using regular all-purpose flour and breadcrumbs.
Eggs: Usually egg-free, but check packaged breadcrumbs.
Peanuts: None added.
Tree nuts: None added.
Nut-free substitutions
No nut-based ingredients are needed. For extra crunch without nuts, use:
Regular breadcrumbs
Gluten-free breadcrumbs
Crushed pork rinds for a low-carb option
Extra Parmesan cheese
Always verify ingredient labels if serving someone with a serious food allergy.
Recipe Variations
Low-Carb Version
Skip the flour and breadcrumbs. Thicken the sauce with a little cream cheese or simply reduce the cream sauce slightly before baking.
Gluten-Free Version
Use a gluten-free flour blend and certified gluten-free breadcrumbs, or leave the breadcrumbs out completely.
High-Protein Version
Replace some of the milk with cottage cheese or Greek yogurt, and add extra mozzarella or Parmesan.
Bacon Cheesy Zucchini Gratin
Add ½ cup cooked, crumbled bacon between the zucchini layers before adding the sauce.
Spicy Version
Add red pepper flakes, cayenne pepper, or sliced jalapeños for a little heat.
Make It a Main Dish
Add cooked shredded chicken, turkey, or browned ground beef to turn this side dish into a complete meal.
Tips for the Best Zucchini Gratin
Slice the zucchini evenly so it cooks at the same rate.
If your zucchini is very watery, lightly salt the slices and let them sit for 10–15 minutes, then pat dry before baking.
Don’t overcook, or the zucchini can become too soft.
For a deeply golden top, broil for 1–2 minutes at the end, watching carefully.
Letting the gratin rest before serving helps the creamy sauce set.
Frequently Asked Questions
1. Can I make Cheesy Zucchini Gratin ahead of time?
Yes. Assemble it up to 24 hours ahead, cover, and refrigerate. Bake when ready to serve.
2. How do I keep the zucchini from becoming watery?
Salt the sliced zucchini lightly and let it sit for 10–15 minutes. Pat away the released moisture before assembling the gratin.
3. Can I use yellow squash instead of zucchini?
Absolutely! Yellow squash works very well, or you can use a combination of zucchini and yellow squash.
4. Can I freeze zucchini gratin?
Freezing is possible, but the zucchini may release extra water after thawing and become softer. It is best enjoyed fresh.
5. How long do leftovers last?
Store leftovers in an airtight container in the refrigerator for up to 3–4 days.
6. How should I reheat it?
Reheat in the oven at 350°F (175°C) until hot and bubbly. A microwave also works, but the topping may lose some crispness.
7. Is this recipe nut-free?
Yes, no peanuts or tree nuts are included in the recipe. Check individual product labels for possible cross-contact if allergies are severe.
8. Can I make it dairy-free?
Yes. Use plant-based butter, unsweetened dairy-free milk or cream, and your favorite dairy-free shredded cheese. Check labels carefully for other allergens.
9. Can I make this without breadcrumbs?
Definitely! Simply leave them out and add a little extra Parmesan for a delicious golden cheese topping.
10. What can I serve with Cheesy Zucchini Gratin?
It pairs wonderfully with grilled chicken, steak, baked salmon, roasted turkey, meatloaf, or a simple fresh salad.
Serving Suggestion
Serve this creamy, cheesy zucchini gratin straight from the oven as a comforting side dish. The tender zucchini and golden melted cheese make it a delicious addition to almost any meal!
With years of experience in restaurant research and local SEO, Sara creates accurate, user-friendly guides that work for both people and search engines. Her goal is to help users go from search results to their nearest restaurant or menu choice with as few clicks as possible.
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