Squash Casserole is a crowd-pleasing side dish made with summer squash, onion, cornbread stuffing mix, and sour cream. It’s perfect for a potluck, but easy enough for a weeknight dinner.

squash casserole recipe in a white casserole dish laying on a striped napkin


The Perfect Way to Use Summer Squash

Zucchini gets so much love during the summer months, but there’s a whole family of squash that deserves some attention too! Aside from zucchini, the most common summer squash is yellow squash, which is what I usually use in this Squash Casserole recipe. Hit up your local farmers market and you’re likely to find a bunch of other varieties:

  • Cousa squash, which looks like plumper, lighter-colored version of zucchini
  • Eight-ball zucchini, a round zucchini that’s perfect for stuffing
  • Yellow zucchini, which is exactly what it sounds like—zucchini that’s a bright, sunshine yellow instead of green
  • Pattypan squash, a pretty little scalloped-edge squash that looks a bit like a flying saucer
  • Zephyr squash, a two-toned squash that’s yellow on top, green on the bottom, with vertical stripes

You can make Squash Casserole with any of these types of squash, or a combination of a few of them!

a plate of squash casserole sitting on a table with the casserole dish in the background

 Easy Squash Casserole Recipe

There are many ways to make Squash Casserole, but this is my favorite because it’s a classic southern side dish and it reminds me of home. The cornbread stuffing mix adds just the right amount of sweetness to complement the savory onion and tangy sour cream.

The problem with some Squash Casserole recipes is that they get water-logged by the time they’re finished baking, but that’s not an issue here. By layering half of the stuffing mix on the bottom of a baking dish and then placing the squash on top, the liquid gets absorbed, creating a tender layer of cornbread stuffing. You’ll put another layer of stuffing mix on top of the squash, and this layer gets crisp and browned. The contrast in textures is so good!

Ingredients + Variations

Here’s what you’ll need to make Summer Squash Casserole:

  • Squash – I use yellow squash, but any summer squash will do. You can also use zucchini!
  • Onion – Swap the onion for shallots if you’re feeling fancy.
  • Cornbread stuffing mix – I always make this Squash Casserole recipe with cornbread stuffing, but herbed stuffing would work too!
  • Sour cream – Some recipes for Squash Casserole call for a cream soup, but I think sour cream is better because it doesn’t overpower the flavor of the stuffing or squash.
  • Butter
  • Olive oil

If you have fresh herbs on hand, try adding some minced rosemary, thyme, or sage to this recipe.

How to Make Yellow Squash Casserole

1. Prepare

Preheat your oven to 350ºF, grease your baking dish, and cut the squash and onion.

2. Cook the Squash

Warm the olive oil in a large skillet over medium-high heat, then add the squash and onions. Sauté them until tender, then stir in the sour cream.

3. Assemble the Casserole

Place half of the stuffing mix in the bottom of the prepared baking dish, then layer the squash mixture over the top. Cover the squash with the rest of the stuffing.

4. Bake the Casserole

Cover the casserole dish and bake it for about 25 minutes, then uncover and bake for 15 more minutes, or until the topping is golden brown and crispy. Cool slightly, then serve.

a wooden spoon serving up squash casserole from the corner of the baking dish


Can you freeze Squash Baked Casserole?

While you can freeze Squash Casserole, I don’t recommend it. Summer squash and zucchini just don’t freeze very well—they tend to get mushy once you thaw and reheat them.

Will a casserole thicken in the oven?

Typically, yes. As the casserole cooks in the oven, it is going to thicken up. This squash recipe with sour cream will also thicken up as it cools.

Should you bake a casserole covered or uncovered?

This casserole is baked uncovered. It helps to brown the top of the casserole recipe while heating and cooking all the way through.

What should I serve with Squash Casserole?

This is the kind of side dish that goes with just about anything! Try it with Easy Grilled BBQ Chicken, Crock Pot Ham, or Air Fryer Chicken Breasts.

More Creamy Casserole Recipes

Who else loves a good, creamy casserole? Here are some reader favorites to try:

Squash Casserole

Squash Casserole is a crowd-pleasing side dish made with summer squash, onion, cornbread stuffing mix, and sour cream. It’s perfect for a potluck and excellent for holiday dinners!
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Course: Side Dish
Cuisine: American
Prep Time: 10 minutes
Cook Time: 35 minutes


  • 3-4 medium squash cut 1/4 inch slices
  • 1 small chopped onion
  • 8 oz cornbread stuffing mix
  • 1 cup sour cream
  • 1/2 cup melted butter
  • 2 tbsp olive oil


  • Add olive oil, squash and onions to a skillet and cook until tender and remove from the heat and add in sour cream. Mix well.
  • Add half of the stuffing mix to the bottom of an 8×8 or 9×9 baking dish.
  • Add the squash mixture over the top of stuffing and then cover with the remaining stuffing mixture.
  • Cover and bake at 350 degrees for 25 minutes. Then, uncover and bake an additional 15 minutes or until topping is brown.
  • Allow to cool slightly before serving.
Did you make this recipe?Mention @kasey_allthingsmamma or tag #allthingsmamma!

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About Kasey Schwartz

For over 15 years, Kasey Schwartz, the mastermind behind All Things Mamma, has been the ultimate go-to for mouthwatering family recipes. Her work has been featured on Today.com, Buzz Feed, Better Homes and Gardens, and more, making her your go-to mom next door for all things delicious and family-friendly.


  1. Do you cook the stuffing mix first?

    1. Shyanne - ATM Team says:

      No, it will cook in the oven! 😊

  2. Made this yummy casserole tonight and it was phenomenal! I wasn’t quite sure what the butter was for, so I just melted it and poured it on top of the casserole, before baking. This is now on the weekly menu!

    1. I’m going to say I think you mix the melted butter with the stuffing mix. When I make veggie casserole the topping is made of crushed Ritz crackers and melted butter. It gets so nice and crisp. Yum.

  3. Sounds good but where do you add butter? At end and pour over dressing or with sour cream?

  4. What is the half cup of butter for?

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