Yellow Squash Casserole is creamy and cheesy with a buttery and crispy Ritz cracker topping. It makes a delicious side dish and is perfect for using fresh summer squash.

Yellow Squash Casserole in white square baking dish.

Yellow Squash Casserole with lots of cheddar cheese and a buttery cracker crumb topping is one of my favorite casseroles to make during the summer months. It’s super creamy with tender slices of summer squash and onion. A combination of mayonnaise and sour cream gives it plenty of creamy flavor.

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Serve Yellow Squash Casserole at a summer potluck or as a comforting side dish for a family meal. I love it with fried chicken. Actually, I think I love everything with fried chicken.  ๐Ÿ™‚

This recipe also makes a great holiday side. My som requests it every Thanksgiving and Christmas.

Yellow squash is plentiful at farmers markets in the south during the summer months and it is easily grown in a home garden so I tend to make this casserole frequently during the summer months. But a creamy casserole like this is also extremely comforting during the cooler months.

Yellow Squash Casserole in square baking dish.

Yellow Squash Casserole Recipe Tip

This casserole is really easy to make. You do want to precook the squash some because you don’t want it to be crunchy at all in the finished casserole. You can either slice it and saute it, steam it, or even microwave it until just tender.

★★★★★
What readers are saying

This is so easy to make! The taste will take back to grandma’s with family all around eating, laughing and good food.

Make Ahead and Storage Suggestions

This recipe can be prepared through Step 5 a day in advance and refrigerated. Leftovers can be stored in an airtight container in the refrigerator for 4 days.

Spoon scooping squash casserole out of baking dish.

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Yellow Squash Casserole

4.96 from 25 votes

By Christin Mahrlig

Prep: 15 minutes
Cook: 30 minutes
Total: 45 minutes
Servings: 6 servings
Squash Casserole is creamy and cheesy with a buttery Ritz cracker topping.
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Ingredients

  • 4 medium yellow squash, ends trimmed and cut into 1/4-inch slices
  • 1 medium onion, sliced
  • salt and pepper
  • 1 egg, lightly beaten
  • 1/4 cup mayonnaise
  • 1/3 cup sour cream
  • 1/4 cup milk
  • 1 cup heaping shredded cheddar cheese
  • 24 Ritz crackers
  • 2 tablespoons butter, melted

Instructions 

  • Preheat oven to 350 degrees and lightly grease a casserole dish.
  • Steam squash and onion until just tender, about 5 to 7 minutes.
  • Season squash and onion with salt and pepper.
  • In a large bowl, whisk together egg, mayonnaise, sour cream, and milk.
  • Stir in cheese, squash and onion. Transfer mixture to casserole dish.
  • Crush crackers and scatter on top of squash. Drizzle with melted butter.
  • Bake for 30 minutes.

Nutrition

Calories: 303kcal | Carbohydrates: 15g | Protein: 9g | Fat: 24g | Saturated Fat: 10g | Polyunsaturated Fat: 6g | Monounsaturated Fat: 6g | Trans Fat: 0.3g | Cholesterol: 69mg | Sodium: 340mg | Potassium: 442mg | Fiber: 2g | Sugar: 6g | Vitamin A: 709IU | Vitamin C: 24mg | Calcium: 207mg | Iron: 1mg

Nutrition information is automatically calculated, so should only be used as an approximation.

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Originally posted May 28, 2016.

Disclosure: This post contains affiliate links.

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46 Comments

  1. Linda Miller says:

    Very good and it goes well with everything!

  2. Dixie says:

    They all sound so good and I will no doubt try them all.

  3. Laurie says:

    Loved it!

  4. Angie says:

    Doubled the recipe, was wonderful!!

  5. Kevin Kneeland says:

    Off the chain casserole !! Easy to prepare and cook,definitely a great way to use up squash that have to be picked every day !! Delicious !!

  6. Betty says:

    This will be my second time making it the first time it was a hit it was last year Christmas dinner and today is my Family reunion and there is going to be a lot more people there I hope everyone will enjoy it

  7. Ruth Harvey says:

    I have cooked this and it is delicious. Much better than using canned soup.

  8. Karen Haskins says:

    Excellent! I add half the crackers to squash mixture.

  9. Lyn says:

    This is my favorite squash casserole recipe, delicious

  10. Lee Ann says:

    Wow! This squash casserole recipe is absolutely DELICIOUS!
    I grow a tropical type of squash called: Snake Gourd (Naga, Python Gourd, Doodhi, etc). Since I didn’t have any yellow squash on hand, I used my snake gourd instead and it turned out so tasty.
    I’m thinking that this recipe would work well with Tromboncino squash or a zucchini squash variety.
    Many thanks for sharing your recipe! ๐Ÿ™‚