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Cheesy Summer Squash Casserole Recipe

Cheesy Summer Squash Casserole Recipe

Onion and cheddar cheese perk up the rich flavor of summer squash in this comforting casserole from Katherine Metz, Jacksonville, Florida (with husband Chuck, at right). A crispy cornflake-crumb topping adds a little crunch.
TOTAL TIME: Prep: 10 min. Bake: 25 min. YIELD:2 servings


  • 2 small yellow summer squash, sliced
  • 1/4 cup chopped onion
  • 1/2 teaspoon salt, divided
  • 1 egg
  • 1/4 cup mayonnaise
  • 2 teaspoons sugar
  • Pepper to taste
  • 1/4 cup shredded cheddar cheese
  • 2 tablespoons crushed cornflakes
  • 1-1/2 teaspoons butter, melted


  • 1. In a small saucepan, combine squash, onion and 1/4 teaspoon salt. Cover with water. Bring to a boil. Reduce heat; simmer, uncovered, for 2 minutes or until squash is crisp-tender. Drain.
  • 2. In a small bowl, whisk the egg, mayonnaise, sugar, pepper and remaining salt until blended. Stir in cheese and squash mixture. Transfer to a greased 2-cup baking dish. Toss the cornflakes and butter; sprinkle over top.
  • 3. Bake, uncovered, at 350° for 25-30 minutes or until golden brown and bubbly. Yield: 2 servings.

Reviews for Cheesy Summer Squash Casserole

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gunslinger User ID: 544392 266177
Reviewed May. 21, 2017

"I made this for a recent potluck and it was creamy, cheesy and delicious. The cornflake topping makes it an attractive dish and adds a nice crunch."

leeart User ID: 2566328 252940
Reviewed Aug. 20, 2016

"This dish was so good that it was all I ate for dinner the other night. DELICIOUS !!!"

sfinch68 User ID: 5786468 252461
Reviewed Aug. 10, 2016

"Absolutely delicious! Made this for the first time tonight - will definitely be making it many more times!"

Debglass11 User ID: 6300479 252131
Reviewed Aug. 2, 2016

"Good casserole! I doubled the recipe, except for the sugar and salt, and used a heaping cup of cheese. Didn't have cornflakes, so I used butter crackers. Definitely worth a try, especially if you have an abundance of summer squash to use up!"

annrms User ID: 2649709 251773
Reviewed Jul. 24, 2016

"Made this recipe with summer squash and zucchini. Added some minced garlic and used panko because I did not have corn flakes. I placed the onion and squash in a large measuring cup along with 2 tablespoons of water. Covered and vented it and microwaved it for 5 minutes. Drained it and patted it dry. I wanted a lighter dish so I skipped the egg. Baked it according to directions. I came out deliciously hot and bubbly. Loved it. Want to try the technique with cauliflower and maybe carrots!!!!"

scotchshortbread User ID: 8549631 235046
Reviewed Oct. 16, 2015

"easy and cheap to make. Several friends asked for the recipe. Added a little parmesan."

joy cooking User ID: 5576389 231370
Reviewed Aug. 17, 2015

"Yum! I cut up 9 small yellow squash (approx. 5-6" long) that amounted to approx. 8 c. Used 4 eggs and 1 c. mayo. I didn't have the recipe in front of me and forgot the onion and sugar, but it was just fine without it. Approx. 1 c. of cheese. Added a couple dashes of an herb blend. Didn't have cornflakes so crushed some croutons on top. It was very good!!"

RoseLuvsRetro User ID: 6093089 216809
Reviewed Jan. 3, 2015

"I have been regularly making this recipe since it was first published. Many times I have quadrupled the portions and brought it to family get togethers. Everyone loves it. Best squash casserole recipe I've found. The only thing I do different is crush New York Texas Toast garlic and butter croutons for the topping."

Kimberly Hines User ID: 1929928 78638
Reviewed Aug. 4, 2014

"This was only ok. Maybe I just don't like summer squash?"

jane428 User ID: 3835785 78532
Reviewed Jul. 17, 2014

"Really good easy recipe even ate it cold!"

EP-PaulaG User ID: 630717 67912
Reviewed Jul. 2, 2014

"We Relly enjoyed the recipe. I did use 4 small squash which was perfect for 2. Just a reminder that not all corn flakes are gluten free. I did use certified gluten free corn flakes and probably closer to 1/4 cup. I will be making this one again."

Mojomom1965 User ID: 7858002 57807
Reviewed Jun. 29, 2014

"This recipe is so good and very easy to prepare."

JaniceBaer User ID: 1723673 67911
Reviewed Mar. 17, 2014

"This was delicious! I'm new to squash recipes and this one won me over. I will be making this one again!"

rganderson22 User ID: 2224675 67905
Reviewed Mar. 8, 2014

"My family really enjoys this. I also use crackers instead of cornflakes as a topping"

[email protected] User ID: 4432358 91889
Reviewed Dec. 27, 2013

"Very Good! I will definitely be making this again. I doubled the recipe and substituted the mayo for sour cream, used brown sugar and replaced the cornflakes with crackers. Everyone loved it! :-D"

dicentra01 User ID: 5468213 145712
Reviewed Dec. 18, 2013

"I thought this was really good. I made it all summer long and decided to make it again tonight for dinner. Love it .... THANKS."

debeyea User ID: 1294512 205932
Reviewed Aug. 14, 2012

"Making it for the second time in less than a week! My family loved it. I was able to adapt it for my dairy allergic kids by swapping out the cheddar for soy cheese. Great way to use up the overabundance of summer squash!"

Sunny1978 User ID: 3946676 61039
Reviewed Sep. 1, 2011

"We really enjoyed this recipe. It had a great flavour and was easy to make. As per a reccomendation I substituted buttery cracker crumbs for the topping and it turned out great."

Miguet User ID: 4140923 138922
Reviewed Aug. 31, 2011

"This is really good! I made it with 3 cups of slices zucchini since I didn't have any of the yellow squash. Instead of cooking it in water, I put it in the microwave with no water for about 3 minutes until it was tender crisp. I did add more cheese than the recipe called for, but that's a personal preference."

SKS2 User ID: 4424767 57806
Reviewed Aug. 30, 2011

"easy to make. I used bread crumbs instead of cornflakes and no butter."

BrittneyR User ID: 5831536 136291
Reviewed Jul. 13, 2011

"Used cracker crumbs in place of the cornflakes and added more cheese. Very tasty! A great alternative for using up all that summer squash!"

grammadebby User ID: 1015752 131617
Reviewed Jun. 29, 2011

"I have a lot of good squash recipes, but I've been searching for a "great" squash casserole recipe. I just found it! This is the best one I have tried. I used buttery cracker crumbs instead of cornflakes. Didn't have cornflakes. It was great. Will make this again and again. Thanks for another great recipe."

momio User ID: 2526647 136290
Reviewed May. 23, 2011

"We really liked it in our family. I put Ritz on instead of cornflakes and I put much more than 2 tablespoons! We like the crumb topping."

NanaBee14 User ID: 3180409 108920
Reviewed Aug. 25, 2010

"I love, love, love this casserole. I love the consistency and the flavor. The first time I cut up the squash for this recipe I did measure it. Two small summer squash equals 2 cups. That is what I use for my measure when I make this casserole. I have substituted Splenda for the sugar (my husband needs to avoid sugar), and this substitution works very well. Enjoy!"

WhateverNYa User ID: 5333317 132471
Reviewed Aug. 19, 2010

"I am not fond of yellow summer squash. I don't think it has much flavor, but when a friend of mine gave me two small ones, I started looking for a recipe. My mom always just cooked it, then put some butter, salt & pepper on it. Boring. I tried this one the other night & I LOVE it!!!!! I've also eaten it cold at lunchtime. You bet, I'll make this recipe again. Many thanks to Katherine Metz for taking the boring out of yellow summer squash. WhateverNY"

mcsbfsb User ID: 2529117 145709
Reviewed Aug. 7, 2010

"I just tripled this recipe and it smells WONDERFUL - had this for the first time for dinner with another couple and we all LOVED it!!!!!! super casserole!!!!"

Loiscooks User ID: 3656565 53682
Reviewed May. 19, 2010

"A great idea for a way to serve squash. I used both zucchini and yellow squash. I did not boil the squash first, as we do not like mushy squash. I increased the baking time so that the squash was cooked just the way we like it. I also used bread crumbs instead of the cornflakes for the topping."

thelouws User ID: 1336762 61034
Reviewed Apr. 29, 2010

"I've made this many times and have had many requests for the recipe! I even make it ahead by assembling everything but the cornflakes (you can use breadcrumbs or cracker crumbs, btw) and refrigerating until that evening. I also double/quadruple the recipe if I want to make more."

onebreast User ID: 3122087 205931
Reviewed Oct. 13, 2008

"Please tell me how many cups of squash to use. Everyone's idea of "small" is different. Also, I froze some summer squash that I will be using and measured by the cup. Thank you. Connie"

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