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!
What is zucchini?
Zucchini is a summer squash. It is native to Central America and Mexico but grown throughout the United States during the warm summer months. While you may think of zucchini as a vegetable, it is a fruit. Zucchini and yellow squash are low in calories with a low glycemic index. Both squashes are a good source of vitamins A and C, fiber, and potassium, and they make an excellent zucchini gratin.
How do you make zucchini gratin?
This delectable recipe could not be any easier! Using an ovenproof skillet, melt the butter and add the onion. Saute until the onion is slightly soft and browned on the edges. Add the garlic and cook one more minute. Add cream and simmer until bubbly and slightly thickened. Slowly stir in the Parmesan then add the zucchini and yellow squash and cook for a few more minutes. Sprinkle with Gouda and bake for 15-20 minutes.
So easy and so delicious. It is amazing what happens to a veggie after you bake it in a bath of cream and cheese. Oh yeah, don’t forget to give credit to the garlic! As if that isn’t enough there is a blanket of smoked gouda on the top to create the most delectable squash dish ever!
More zucchini recipes you will love!
Zucchini and Yellow Squash Au Gratin
Ingredients
- 2 tablespoons butter
- 1/2 onion thinly sliced
- 1 small zucchini sliced in rounds 1/8 to 1/4 inch thick please see notes
- 1 small yellow squash sliced in rounds 1/8 to 1/4 inch thick please see notes
- 2 large cloves garlic minced
- 1/2 cup heavy cream
- 1/4 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
Notes
Nutrition
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https://www.smalltownwoman.com/wp-content/uploads/2019/05/Beth-1.pdf
Jean
I am so excited to make this tonight only I am adding fresh mushrooms, and tomatoes/bacon bits on top. Thank you for sharing.
Beth Pierce
Sounds delicious! You are most welcome. I am going to try bacon bits on it the next time I cook it! Yummy!!
Anita Wilson
This recipe sounds fabulous. I have a question – can I assemble it tonight and bake it tomorrow? Will it make it too mushy? Thank you in advance.
Beth Pierce
Yes I think it might affect it although I have not tried that. If you try that please let use know how it turned out!
Carolyn
Made this tonight in my new iron skillet but with half-and-half and cheddar (all I had on hand) and it was delicious! So simple, not mushy, perfect balance of vege and cheese. I’ve been looking for a recipe like this for a long time. Thank you! By the way, I posted it on Insta but wasn’t sure your handle to give you credit (so I used your website).
Beth Pierce
Thanks so much Carolyn. Your kind actions and words mean so much to me! So glad that you liked it!
Cherlyn Marks
I refer to myself as s food snob. This dish was incredible!! I bought a high quality smoked Gouda which I think is very important. I made this dish for a ladies group pot luck. I thought they were going to lick the casserole clean!! Thank you so very much for elevating a basic, easy to make recipe and making it something truly special!
Beth Pierce
I am so glad that they liked it. Thanks so much for writing such a sweet complement. It has made my morning!! I consider myself a little bit of a food snob too…just a little bit!!
Christine
This sounds absolutely amazing! The only way I can get my kids to eat Zucchini or Yellow Squash is to cover it in cheese. I love addition of smoked gouda. That just sends it over the top! Yum!
Beth Pierce
Thanks so much. I love this dish! Glad that kids like it too!!
gina
Such a great recipe. I’m always looking for new ways to Cook squash and this is definitely a keeper. and Iran keto friendly. Win win. THanks for sharing!
gina
Sorry spell check. Meant to say And it’s keto friendly
Beth Pierce
You are most welcome!!
Margie
Hi. If you have minced garlic in a jar, how much would you use? Thanks.
Beth Pierce
Same amount.
Patricia
If garlic is minced in jar how can you use the same amount
Beth Pierce
Yes you can.
Cassidy
I think Patricia means that it is difficult to measure garlic in cloves when it is already minced, and an amount in tablespoons/etc would be more straightforward for that. I used 1 and a half tablespoons of minced garlic from the jar and it worked fine!
Linda Rankin
Most jars will have the measurement equivalents…1 heaping teaspoon=1 large garlic clove.
Susan Boulanger
I am going to try this tomorrow, way too hot today to have my oven on 450 degrees. I don’t have smoked gouda either, so 1. The store or 2. I will use any other cheese I have on hand. I will revisit this after but wanted to say this Looks like a fun recipe to try. I get my zucchini and summer squash at Costco, never mind what’s growing in my gardens, they’re just about ready now. Another fun recipe I make is the zucchini nacho recipe I found on the internet. The spicy one with roundscut half inch wide. I have been doing Low Carb since Feb. So I am always looking for new recipes. Thank You.
Beth Pierce
You are most welcome. I will have to check around for the zucchini nacho recipe. It sounds delicious. Thanks for the heads up!!
Chrystal
Hard to find Gouda cheese here so I used parmesan and asiago. Great recipe.
Beth Pierce
Great choice of substitutions. So glad that you enjoyed it. Thank you!
Tina
This was delicious!! We paired it with salmon and it was a winning combo. I will definitely make this again and again over the summer! I didn’t have gouda (though omg, this would be phenomenal with smoked gouda!) so I used fresh parmesan–I actually DID have it on hand–and topped it with sharp cheddar. There were NO leftovers! Thanks so much for a winning recipe!
Beth Pierce
You are so very welcome. I am so glad that you liked it. Thanks for taking the time to leave such a nice complement!
Tina
Shoot! You’re so welcome! I have to put this out there too: I’m not opposed to spending an hour cooking (I cook most things from scratch), but I have to say that this recipe was SO EASY and quick to put together! The thing that took the longest was browning the onion, but that time was SO WORTH it for the flavor the caramelized onions added to the dish. I didn’t cook the squash and zucchini in the skillet (not to save time, just because I didn’t want mush). I put half of them in the skillet to coat them with the sauce, and poured that on the rest that I’d already layered in my casserole dish and cooked for 20 minutes. It came out perfect to our tastes. And like I said, NO LEFTOVERS–always a good indication of a GREAT recipe!
Bev
THis sounds great. Fixing it tonight
Beth Pierce
Thanks so much!!
Mekki
This was the best casserole I have ever made!! New staple at all our holiday get togethers!
Beth Pierce
Oh thank you so much! Long day! I needed this sweet comment this afternoon.
LaVonda H
It was soooo delicious! I had to triple the recipe. But everything was easy to assemble and tasted divine! So happy I found this recipe! Will be making it again- especially since my garden is producing the squash! Thanks for sharing your recipe with us!!!
Beth Pierce
So glad that you liked it LaVonda! It is even more delicious with garden fresh squash.
Lisa/hrrlvr
Made this & brought to a cookout, everyone loved it. I didn’t have Gouda, so used a 3 cheese blend with cheddar. Can’t wait to make it w/smoked Gouda, it’s my favorite! It came out very watery but was still very delicious, next time I will either sweat them or try in a cast iron skillet (water seems to evaporate better in a hot cast iron). Thank you so much for this delicious recipe!! Can’t give it enough stars!⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️
Beth Pierce
Thanks Lisa! So happy to hear that everyone loved it!
Brandi
I make a dish very similar to this but it has sliced tomatoes on top of the squash/zucchini. If you like tomatoes, it’s delicious! Especially home grown tomatoes in the summer!
Beth Pierce
Sounds delicious. Home grown tomatoes are the best!!
Carol
Yes, that sounds so good! ? on top and I have fresh from the stands, someone garden! Yummy and Thank you for the idea. ???
Beth Pierce
You are most welcome.
melly
well, this is delicious! thanks for the recipe!
bpierce
You are most welcome! 🙂
melly
I had the leftovers for breakfast! 🙂
bpierce
Sounds like a great breakfast! LOL 🙂
Madeline
Relish !!!!
Tara Ingram
I am going to try this tomorrow, don’t have time to go to the grocery store to get gouda cheese, I will try it with cheddar and Monterrey jack cheese and see how that turns out. This is a simple recipe and I will probably make it all summer long! Thanks for sharing this!
bpierce
You are most welcome. Let us know how the cheddar and Monterey Jack cheese turns out!!!
Trish K
Thanks for the recipe! I had just purchased some yellow squash & zucchini on Sunday, and I am excited to try this! I’ll let you know how it turns out! I am pairing it with meatballs & a spinach/romaine salad for my family this evening.
Take care!
Trish
bpierce
Great ideas. Thanks for sharing! 🙂 Love for people to post back again~
Carrie
Do you have the nutrition info for this?
Beth Pierce
I am sorry Carrie I have not added nutritional information yet. Maybe I can get that taken care of soon.
Brian
Where are the carbs coming from??
Beth Pierce
Onions and zucchini
Suzy
Have made squash augratin and it’s so savory and flavorful the smoked Gouda is so good in this casserole making again today
Beth Pierce
Thanks so much Suzy! So glad that you like it!
Connie
No onions listed in the veggies…
Beth Pierce
I just looked. Second ingredient listed – 1/2 onion thinly sliced.
Rhonda
you never mention in directions when to add garlic??
bpierce
Thanks for the heads up! I appreciate it! It has been corrected! Happy cooking!
Kathy
Just after sautéing onions.
Thereaa
It says to cook onions for 5min. Then add garlic and cook another one min.
Dale Herring
Second line in step 2..