Zucchini Gratin with Yellow Squash is a luscious, creamy, cheesy medley of zucchini, yellow squash, onions, and garlic. It is quick and easy to prepare. It will make a summer squash lover out of you!
Summer is in full force here; with it comes lots of fresh zucchini and yellow squash. Even if you don’t grow it, the season brings such an abundance that the market price drops, consequently making this dish even more desirable. This delectable Zucchini Gratin takes about 15 minutes of your devoted time, and then it is in the oven for an additional 15-20 minutes, making it very doable for a weeknight meal. This recipe will bring out a passion for zucchini and squash that you never knew you had!
Ingredient Notes with Substitutions
See the complete list of ingredients on the recipe card below.
- Squash: Look for medium-sized, unblemished, firm squash.
- Heavy Cream: You can substitute whipping cream.
- Parmesan Cheese: Use freshly grated Parmesan for the best flavor.
- Gouda: You can use mild, sharp, extra sharp cheddar, Edam, Havarti, or Monterey Jack.
How to Make Zucchini Gratin
This is a summary version; for the complete list of ingredients and instructions, please refer to the recipe card below.
- Using an ovenproof skillet, melt the butter and toss in the onion to sauté until slightly soft and browned. Add the garlic and cook another minute.
- Add cream and simmer until bubbly and slightly thickened. Slowly stir in the Parmesan, then add the zucchini and yellow squash and cook a few more minutes.
- Sprinkle with Gouda and bake for 15-20 minutes.
Preparation Tips
- The zucchini that I used were on the smaller side. Some of the late summer zucchini I see coming in are much larger. For those, I would double the cream and the Parmesan.
- The large zucchini are sometimes a little tougher and may require additional simmering and/or baking time.
More Zucchini Recipes
Zucchini and Yellow Squash Au Gratin
Ingredients
- 2 tablespoons butter
- ½ onion, thinly sliced
- 1 small zucchini, sliced in rounds ⅛-¼ inch thick
- 1 small yellow squash, sliced in rounds ⅛-¼ inch thick
- 2 large cloves garlic, minced
- ½ cup heavy cream
- ¼ cup grated parmesan
- 1 cup shredded smoked gouda
Instructions
- Preheat oven to 450 degrees.
- Melt butter in an oven-proof skillet over medium heat. Add onion and cook until the edges start to brown, approximately 5 minutes. Add garlic and cook for an additional 1 minute. Add cream and simmer until bubbly and starting to thicken. Slowly stir in parmesan. Add zucchini and yellow squash and cook an additional 4-5 minutes.
- Sprinkle with smoked gouda and bake in the oven for 15-20 minutes or until cheese is golden brown.
Video
Nutrition
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Jill Franks
This is one of our favorite side dishes!! Thank you so much for sharing this recipe!
Beth Pierce
The pleasure is all mine, Jill!
Cheryl
This was amazing. An awesome way to use the plethora of squash from the garden. We sliced the squash very thin (mandolin) and it was perfect. Thank you
Beth Pierce
You are most welcome, Cheryl!
Beth Findley
Omgosh I can’t say enough about how delish this is!!!! My husband also loved it. We used veggies out of our freezer and I didn’t have access to the smoked cheese so I used the regular one. We will be having this again next week. Wow!
Beth Pierce
Thanks, Beth! I am so glad that you and your husband enjoyed it!
Karen
This sounds amazing! Is there a substitute you recommend if I don’t have gouda cheese?
Beth Pierce
Cheddar works well!
Amy
I used all yellow squash because that is what I had. I skimped a bit on the onion, garlic and Ghouda but it was still wonderful. I will make again and I use the amounts called for.
Andrea S.
Easy and delish! What more do you want!?! I followed the directions exactly and the dish was everything I expected and more. Definitely will make this again.
Beth Pierce
Thank you, Andrea! I am so glad that you liked it!
Bunni Menius
Easy and delicious way to use all the extra squash/zuchinni! In place of the smoked Gouda, I used crumbled Bleu cheese that I had on hand. I also added a sprinkle of pork rind “crumbs” and it was divine if you enjoy Bleu cheese. Next time I will use the smoked Gouda. I’m sure it will be amazing!
Beth Pierce
Thank you, Bunni! So glad that you liked it!
Liz
What if I don’t have heavy cream? I have everything else.. I have milk and 1/2 & 1/2..
Thanks
Beth Pierce
You can try it with half and half but it will not reduce the way heavy cream does.
Patricia Vinyard
This was outstanding! I used sharp cheddar cheese that I had on hand instead of Gouda. Not a big fan of squash normally, this recipe is like something from a fine restaurant.
Beth Pierce
Thank you, Patricia! I am glad that you liked it!
Will G
Holy Smokes. This is really good. I followed the recipe exactly and it was fantastic. The smoked gouda did something magical.
Beth Pierce
Thank you, Will! So glad that you liked it!