A Southern squash casserole has a very cozy quality. It brings back memories of summer dinners at my grandmother’s house, where the aroma of caramelized onions, melted butter, and sunshine poured into a baking dish filled the kitchen. There’s something timeless and timeless about this dish. It’s warm, creamy, cheesy, and has a golden buttery topping that gives it the perfect crunch. This casserole is always a hit whether you’re serving it at a potluck, holiday dinner, or just as a side dish to add some color to a weeknight meal.

The highlight of this dish is the yellow squash, which is sautéed until it becomes tender and combined with cheese, onion, and a hint of creamy goodness before being garnished with crushed buttery crackers. It’s easy to use, reasonably priced, and appeals to all nostalgia. Once you try this casserole, you’ll see why Southern cooks have been making it for generations.

Why Do I Love This Recipe?

I love this recipe because it’s deeply nostalgic and incredibly versatile. It’s a celebration of humble ingredients coming together to create something greater than the sum of its parts. It’s also a crowd-pleaser — even people who think they don’t like squash end up going back for seconds. It’s the ultimate Southern side that warms both the belly and the heart.

Serving Suggestions

Southern squash casserole pairs beautifully with just about anything. Serve it alongside:

Fried chicken or baked chicken
Grilled pork chops or ribs
Roasted turkey during the holidays
A fresh green salad for a lighter meal

Add some iced tea and cornbread, and you’ve got yourself a Southern feast.

Storage & Freezing

Store any leftovers in an airtight container in the refrigerator for up to 4 days. To reheat, simply cover with foil and warm in a 350°F oven until heated through.

Want to freeze it? Assemble the casserole without baking, wrap tightly in foil and plastic wrap, and freeze for up to 2 months. When ready, thaw overnight in the fridge and bake as directed.

Variations of the Recipe

Add protein: Mix in cooked shredded chicken or ground sausage for a heartier dish.
Go gluten-free: Use gluten-free cracker crumbs or crushed pork rinds for the topping.
Try other cheese: Swap cheddar for Monterey Jack, mozzarella, or a smoky gouda.
Spice it up: Add a dash of cayenne or jalapeños for a little Southern heat.

Southern Squash Casserole

There’s something timeless and timeless about this dish. It’s warm, creamy, cheesy, and has a golden buttery topping that gives it the perfect crunch. This casserole is always a hit whether you’re serving it at a potluck, holiday dinner, or just as a side dish to add some color to a weeknight meal.

Print Recipe Pin Recipe

Course: Appetizer, Dinner, Side Dish

Cuisine: American

Ingredients Method

Ingredients

Casserole Base:

3 lbs yellow squash sliced or diced
½ cup Vidalia onion finely diced (optional)
1 10.5 oz can cream of mushroom or cream of chicken soup
1 cup mayonnaise
1 large egg
8 oz shredded sharp cheddar cheese
1 tsp salt
½ tsp freshly ground black pepper

Topping:

2 sleeves Ritz crackers crushed
1 stick ½ cup butter, melted

Method

Preheat your oven:

Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with cooking spray or butter.

Cook the squash:

In a large pot, bring salted water to a boil. Add the squash and onion (if using), and cook until tender, about 7–10 minutes. Drain well and lightly mash to release excess water.

Prepare the filling:

In a large mixing bowl, stir together the cream of soup, mayonnaise, egg, cheddar cheese, salt, and pepper. Fold in the cooked squash mixture until fully combined.