The Best Squash Casserole

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The Best Squash Casserole is classic southern comfort food made with yellow squash, onions, sour cream, cheese, and a buttery cracker topping. This yellow squash recipe has everything you love without condensed soup...and the flavor is amazing! 

squash casserole being scooped out of a white dish
The Best Squash Casserole
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Why You'll Love It

  • easy casserole to make and bake
  • great way to use up fresh squash from a summer garden
  • family favorite at your holiday table
  • can be served as a main dish or side
  • budget friendly casserole dish with tons of flavor!

Recipe Highlights

Southern Squash Casserole is a classic dish that's been around a long time. Most folks like to use cream of mushroom soup to make it, but I promise you'll love this new recipe that has no MSG or artificial ingredients!

The addition of sour cream, along with mayonnaise and eggs, creates a creamy sauce that is made even better by including two kinds of cheese. It's the perfect combination that makes a great side dish or family dinner everyone will love.

The delicious topping made with buttery cracker crumbs and french fried onions will have the whole family coming back for seconds!

I know you've been making this dish for years, but y'all...this recipe is worth a second look. Folks tell me they'll never go back to the old way of making it after trying this version!

squash casserole after it has been served with crumbs in a plate.

Ingredients

  • During the summer months, we always have extra squash in our garden. This recipe is the perfect way to turn an abundance of squash into a cheesy squash casserole recipe.
  • Summer squash casserole is so easy to put together, it's ready to pop in the oven in just 15 minutes!
  • See recipe card for quantities.

Squash Mixture

  • butter - can use olive oil if preferred
  • fresh yellow squash - quartered and diced
  • sweet onion - diced
  • garlic salt - adds just the right touch of flavor

Filling

  • sour cream - adds creaminess to this dish
  • mayonnaise - is a great binder
  • sharp cheddar cheese - shredded by hand or pre-shredded in a bag
  • parmesan cheese - shredded (not grated)
  • large eggs - binds casserole together

Topping

  • butter - melted
  • Ritz™ crackers - crushed
  • french fried onions - crushed
ingredients needed to make squash casserole.

How to Make Squash Casserole

  • Add squash, onion, and garlic salt to a skillet. Saute' for 10 minutes over medium-high heat until tender. Take off heat.
  • Fold in sour cream, mayonnaise, cheddar and parmesan to the skillet. Stir well. Beat eggs and mix well with filling. Pour contents into a 13 X 9 inch baking dish.
  • In a separate bowl, melt butter in microwave. Crush crackers and french fried onions in a large baggie, then mix with melted butter in bowl.
  • Sprinkle cracker mixture over squash casserole. Bake for 30 minutes until topping is golden brown and filling is bubbly.
  • Cover squash casserole with aluminum foil to keep warm until ready to serve.

Recipe FAQS

What type of squash works best in a casserole?

Yellow squash is the best squash to use in a casserole because the seeds are tender and do not have to be removed. You can also eat the skin, which makes yellow squash a great choice for this recipe.

What meat goes with squash casserole?

Any type of meat tastes great alongside this dish. Try pork tenderloin, glazed ham, pot roast, and fried chicken to name a few!

How do you keep squash casserole from getting watery?

If you follow the instructions in this recipe your squash will not be watery. Cooking it in a skillet with butter instead of boiling it in water makes the squash turn out perfectly every time.

Will the casserole be creamy without cream of mushroom soup?

Yes! This recipe is so creamy and rich, you won't even miss the condensed soup version. Try it and see what you think! Don't forget to leave a comment below this recipe.

Can I use frozen squash in this recipe?

Absolutely! Frozen squash works great in this recipe as long as it is drained properly. Rinse it well and squeeze squash with a dish towel before using.

close up photo of squash casserole.

Expert Tips

  • Sautéing onions and squash in butter gives this dish its robust flavor.
  • Adding a dash of garlic salt to the squash while sautéing adds depth.
  • Use two cheeses for best results. Make sure one of them is parmesan.
  • Feel free to substitute zucchini for squash if you wish, but the flavor will change.

Storage and Freezing

Squash casserole freezes well before or after it's cooked for up to 3 months in an airtight container. To reheat, thaw overnight in fridge, then bake as directed in instructions.

Leftovers can be stored in the refrigerator for up to 3 days in an airtight container. To crisp up the topping, bake leftovers in a 350 degree oven until warmed throughout and topping is crunchy.

What Readers Say:

"I made this and it was great! What I especially liked is that I could just make it for 2 people. The parmesan cheese was the kicker that really made this dish! Took squash to a new level"

CONNIE JONES

What to Serve with Squash Casserole

Casseroles are a southern way of life! This recipe is one of our family's favorite side dishes. Check out these other amazing recipes that go well with this southern squash casserole recipe...

More Casseroles

Main Dishes

Recipe Card

a spoon being lifted up over a squash casserole showing ingredients.

The Best Squash Casserole

Squash casserole is a classic southern comfort food made with yellow squash, onions, sour cream, cheese, and a buttery cracker topping.
5 from 19 votes
Print Pin Rate
Course: Side Dishes
Cuisine: Casserole
Prep Time: 15 minutes
Cook Time: 30 minutes
Total Time: 45 minutes
Servings8
Calories: 397kcal

*See notes in blog post for detailed tips, photos and instructions.

Ingredients

SQUASH

  • 2 Tbsp. butter
  • 3 large yellow squash quartered and diced
  • 1 small sweet onion diced
  • ½ teaspoon garlic salt with parsley

FILLING

  • 1 cup sour cream
  • ½ cup mayonnaise I use Duke's
  • 8 oz. pkg. sharp cheddar cheese shredded
  • 1 cup parmesan cheese shredded
  • 2 eggs beaten

TOPPING

  • ¼ stick butter melted
  • 1 sleeve Ritz crackers crushed
  • ½ cup french fried onions crushed

Instructions

  • Preheat oven to 350 degrees.
  • Melt butter in skillet.  Add squash, onion, and garlic salt.
  • Saute' for 10 minutes over medium heat until tender.  Take off heat.
  • Add sour cream, mayonnaise, cheddar and parmesan to the skillet. Stir well. 
  • Beat 2 eggs and mix well with filling. 
  • Pour contents of skillet into a large casserole dish.
  • In a separate bowl, melt butter in microwave.
  • Crush crackers and french fried onions in a large baggie and mix with melted butter in bowl.
  • Sprinkle cracker mixture over squash casserole.
  • Bake for 30 minutes until topping is golden brown.

Notes

  • Squash casserole pairs well with fried chicken, pork tenderloin and glazed ham
  • Use two cheeses for best results. Make sure one of them is parmesan.
  • Squash casserole freezes well before or after it's cooked for up to 3 months in an airtight container. To reheat, thaw overnight in fridge, then bake as directed in instructions.
  • View the Google Web Story for Squash Casserole!

Nutrition

Calories: 397kcal | Carbohydrates: 7g | Protein: 15g | Fat: 35g | Saturated Fat: 16g | Sodium: 710mg | Potassium: 312mg | Fiber: 1g | Sugar: 4g | Vitamin C: 14mg | Calcium: 407mg | Iron: 1mg

Nutrition info is an auto generated estimate.

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37 Comments

  1. 5 stars
    This is absolutely wonderful! I have tried out several recipes because I had an abundance of squash...this one! The sharpness of the cheese and the crumb topping was divine! I did not have french fried onions, but had minced dried onions and they worked great. I also already had shredded some sharp cheese and when I took it out it had some pepperjack in with it, I don't know if this made a difference but I may use half sharp and half pj next time. There will be a next time 😀

  2. 5 stars
    I was just wondering what you would think about adding crispy chopped bacon to this recipe? I ABSOLUTELY love squash casserole! I believe that this one actually will replace my other recipe on Pinterest am my go to recipe!! For some reason I just kept thinking BACON… but that is just me, after all, everything is better with bacon, Right?
    I would love to hear your feedback before I make a mistake!
    ❤️❤️❤️❤️

  3. 5 stars
    Alternating squash is easy if you puncture the seed cavity of the squash 3 or 4 times with a knife. Bake the squash until easily poked with a knife. Cool a bit, then slice open and easily scoop out the squash flesh with a spoon.

  4. 5 stars
    Hi Debi,

    Since squash come in many sizes, would you please give an approximate measure in cups how much fresh, unpeeled, diced squash to use?

    Thanks so much!
    Theresa Day

    1. Plan on 3 large squash or 3 to 4 cups of diced and unpeeled yellow squash. Anything in that range will do nicely!

  5. 5 stars
    I would love to make for Easter, hope someone will help me. Ritz crackers are not sold in a sleeve in Canada, how many crackers will I need? Please and Thank you. Happy Easter 2022 to everyone. So nice to see our friends again.

  6. 5 stars
    Can you use butternut squash for this recipe? I also have a spaghetti squash what do you think about using that?

    1. Hi Jackie. I think butternut squash would work in this recipe, but spaghetti squash might get too mushy. I've never tried either one, so if you do, please write back and let me know how it worked out!

  7. 5 stars
    This reminds me of my papa! I love it! Thanks for linking it up to Meal Plan Monday this week!

      1. 5 stars
        I'm not a fan of Sour Cream or Parmesan. I make my Squash Casserole simply Boiling My Squash & Onions until Crisp Tender with just enough water to cover Squash. Drain Completely. While it's draining I add a Can of Cream of Mushroom Soup then Gently Fold in Squash & Onions. I Use Pepperidge Farm Stuffing Mix for The Topping. My Mamaw Used 1 Sleeve Ritz Crackers with Just enough Melted Butter To Moisten. But I will Definitely Try your Recipe

        1. Thank you for sharing your variations, Stephanie! Sounds like the recipe my mom used to make.

    1. Wow, Julia! You made my day! So glad you loved it. Thanks so much for taking the time to leave a comment. 🙂

    2. 5 stars
      Since my hubby of 37 yrs is on keto this dish is perfect! I served it with Delmonico steak and smashed cauliflower. We both loved it! Ty Debi for sharing! Will make this again after we finish off leftovers! I will make this next holiday!

      1. Thank you Nessa! So glad to hear that you were able to serve my squash casserole as a keto dish. 🙂 Yay!

  8. 5 stars
    I made this and it was great! What I especially liked is that I could just make it for 2 people. The Parmesan cheese was the kicker that really made this dish! Took a squash to a new level!

    1. Hi Becky. Great question! 🙂 Since this squash is of the yellow variety, the seeds are very soft and edible, so it's not necessary to remove them.

      1. Had this today and it was delicious! My husband that does not like vegetables gobbled it up!

          1. Hi Jan. Yes, you can use frozen squash, but it might be a little mushy. I wouldn't precook it quite as long in the skillet. Saute your onions and add the squash at the end for just a few minutes to thaw. Then, proceed as usual.

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