Classic Southern Squash Casserole Recipe

There’s something undeniably nostalgic about Classic Southern Squash Casserole: just the mention instantly brings back memories of festive gatherings and comforting family dinners. Tender yellow squash and sweet onions are enveloped in a rich, cheesy filling, then topped with a buttery, crispy cracker crust that practically begs to be scooped up for seconds. Whether you’re hosting a holiday feast or just want to cozy up with a taste of Southern tradition, this casserole always charms the table with its colorful warmth and irresistible flavors.

Ingredients You’ll Need

The magic of a Classic Southern Squash Casserole lies in its simplicity—every ingredient is easy to find and brings a key element, from a velvety texture to a vibrant punch of color and cheesy goodness. These pantry staples come together to create a side dish that’s as effortless as it is downright delectable.

• Yellow squash (4 cups, thinly sliced): The star of the show, this mild, tender vegetable adds beautiful color and soaks up every bit of savory flavor.
• Yellow onion (1/2 cup, finely chopped): Provides gentle sweetness and depth, helping the squash shine.
• Butter (1 tablespoon for sautéing): Ensures the veggies become melt-in-your-mouth tender and adds richness.
• Salt (1/2 teaspoon): Balances the flavors and brings everything to life.
• Black pepper (1/4 teaspoon): Adds just a hint of gentle warmth to balance the creamy filling.
• Sour cream (1/2 cup): Gives the casserole a tangy, luscious body that’s impossible to resist.
• Mayonnaise (1/2 cup): Rounds out the filling with even more creaminess for that classic Southern casserole zest.
• Shredded cheddar cheese (1 cup): Melts right in for gooey, cheesy perfection.
• Egg (1 large, beaten): Binds the filling and adds a delicate, custardy richness.
• Crushed buttery crackers (1 cup, like Ritz): This is the secret to that crave-worthy golden crust.
• Melted butter (2 tablespoons): Coats the cracker topping, making every bite crisp and flavorful.

How to Make Classic Southern Squash Casserole

Step 1: Preheat and Prep

Begin by setting your oven to 350°F (175°C) to create that perfect hot environment. While it preheats, lightly grease a 9×9 inch baking dish—this ensures your Classic Southern Squash Casserole will slide out easily, showing off all its gorgeous, bubbling layers.

Step 2: Sauté the Squash and Onion

In a large skillet, melt a tablespoon of butter over medium heat. Toss in the sliced squash and chopped onion. Sauté for about 10 to 12 minutes until everything turns soft and fragrant—the squash should look glossy, and the onions should be translucent. This step coaxes out all the natural sweetness, making every bite more flavorful.

Step 3: Drain the Mixture

Transfer the squash and onion mixture to a large bowl, but before doing anything else, drain off any excess liquid. This keeps your casserole from becoming watery, which is my number one tip for that perfectly creamy texture.

Step 4: Combine the Filling

Add in the salt, black pepper, sour cream, mayonnaise, shredded cheddar, and beaten egg to the warm squash mixture. Mix thoroughly until everything is well-combined and creamy—the mingling of tangy, sharp, and savory notes starts right here!

Step 5: Assemble the Casserole

Spread the squash-cheese mixture evenly into your prepared baking dish. Take a moment to smooth out the surface; this makes a nice canvas for that tempting cracker crust.

Step 6: Prepare the Topping

In a small bowl, combine your crushed buttery crackers with the melted butter. Stir until all the crumbs are well-coated—this step adds that signature crunch that makes Classic Southern Squash Casserole unforgettable.

Step 7: Bake to Perfection

Sprinkle the buttery cracker crumbs over the top of your casserole. Bake uncovered for 25 to 30 minutes, or until the crust is a deep golden brown and the casserole is bubbling happily around the edges. Let it rest for about 5 minutes before serving, to set the silky filling for perfect slices.

How to Serve Classic Southern Squash Casserole

Garnishes

A bright sprinkle of fresh parsley, a few sliced green onions, or even a dusting of extra cheddar cheese can add a pop of color and bring out the best in your Classic Southern Squash Casserole. These finishing touches make it look inviting and give a little fresh flavor contrast.

Side Dishes

This casserole pairs beautifully with everything from roast chicken to ham, barbecue pulled pork, or a sunny plate of fried catfish. For vegetarian spreads, serve it with collard greens, cornbread, and tomato salad—the classic Southern companions that let this dish shine even brighter.

Creative Ways to Present

Try spooning the casserole into individual ramekins before baking for a fun, personal touch at parties. You can also scoop the finished casserole into hollowed-out squash shells for a rustic, showstopping presentation that wows a crowd.

Make Ahead and Storage

Storing Leftovers

If you have leftovers, simply cover the casserole tightly with foil or transfer to an airtight container, then refrigerate for up to 3 days. The flavors deepen as it sits, making tomorrow’s lunch or dinner even more tempting.

Freezing

Classic Southern Squash Casserole can be frozen for up to 2 months. Wrap the cooled casserole tightly with plastic wrap and then foil. Thaw overnight in the fridge before reheating so you don’t lose that golden crust or creamy texture.

Reheating

For best results, reheat in a 350°F oven until warmed through and the top crisps up again—usually about 15 minutes. A quick zap in the microwave works too, though oven reheating keeps that crunchy magic alive.

FAQs

Can I use zucchini instead of yellow squash?

Absolutely! Zucchini is a great stand-in if yellow squash isn’t available, though the color and flavor will be a bit different. The classic Southern touch might be missed, but it’s still delicious.

Is there a substitute for mayonnaise?

If you’re not a mayonnaise fan, try using more sour cream or even Greek yogurt. It changes the tang slightly, but keeps that creamy, dreamy texture intact.

Can I make Classic Southern Squash Casserole ahead of time?

You can assemble the casserole (without the cracker topping) up to a day in advance and keep it covered in the fridge. Add the cracker crust just before baking for maximum crunch.

What’s the best cheese to use?

Sharp cheddar cheese is classic for this recipe, melting beautifully and giving the casserole that signature bold flavor. Feel free to blend in a little Monterey Jack or Colby for extra creaminess.

Can I make this gluten-free?

Definitely—just swap the regular crackers for your favorite gluten-free buttery crackers. All the classic comfort with none of the worry.

Final Thoughts

If you’re craving warmth, comfort, and a side dish that instantly draws people to the table, Classic Southern Squash Casserole is the answer. From family reunions to quiet weeknights, its blend of creamy squash and crispy topping never fails to please. Don’t wait for a special occasion—bring a taste of the South home tonight!

Print