Name: Southern Squash Casserole Recipe
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Cuisine: Southern
Ingredients: 4 Tablespoons unsalted butter (divided); 4 heaping cups sliced yellow squash (sliced about 1/8 inch thick, from about four small squash); 1/2 cup sweet onion (diced); 2 large cloves garlic (minced); 1/2 cup mayonnaise (full fat, room temperature); 1/4 cup sour cream (full fat, room temperature); 1 large egg (beaten); 2 cups shredded sharp cheddar cheese (divided); 1 teaspoon salt; 1/2 teaspoon black pepper; 1 sleeve Ritz crackers (crushed, about 30 crackers)

Jump to Recipe· 4.1 from 22 reviews

If you’re craving a dish that wraps you in comforting, homey goodness with every bite, this Southern Squash Casserole Recipe is exactly what you need. It’s loaded with tender yellow squash and sharp cheddar, baked to golden perfection with a buttery, crispy cracker topping that delivers the perfect balance of creamy, savory, and crunchy. This casserole is a classic Southern favorite that feels like a warm hug on a plate, guaranteed to brighten up your dinner table and impress your family and friends with its rich flavors and incredible texture.

Ingredients You’ll Need

The image shows several white bowls arranged on a white marbled surface, each holding a different ingredient for a recipe. At the center bottom is a large clear glass bowl filled with round yellow slices of yellow squash. Above and around it are smaller white bowls containing chopped white onions, round light brown crackers, finely chopped garlic, bright orange shredded cheese, creamy white sour cream, smooth pale yellow mayo, beaten egg with orange-yellow color, and a stick of butter. There are tiny salt and pepper shakers near the bowls, adding to the ingredients. The layout is clean and organized in a top-down view photo taken with an iphone --ar 4:5 --v 7

Every ingredient in this Southern Squash Casserole Recipe is carefully chosen to build layers of texture and flavor without any fuss. From the fresh yellow squash that brings vibrant color and tenderness, to the sharp cheddar cheese adding a delightful tang, these simple elements come together to create a timeless dish everyone will love.

4 Tablespoons unsalted butter (divided): Provides a rich base for sautéing and creates a golden, crispy topping that’s irresistible.
4 heaping cups sliced yellow squash: Fresh and tender squash sliced thin, bringing a subtle sweetness and soft texture.
1/2 cup sweet onion (diced): Adds a gentle aromatic sweetness that complements the squash perfectly.
2 large cloves garlic (minced): Brightens the dish with a bit of depth and a touch of savory warmth.
1/2 cup mayonnaise (full fat, room temperature): Creates the creamy base that pulls all the ingredients together.
1/4 cup sour cream (full fat, room temperature): Adds tanginess and richness to enhance the smooth texture.
1 large egg (beaten): Acts as a binder to hold the casserole beautifully intact after baking.
2 cups shredded sharp cheddar cheese (divided): Sharp cheddar offers that classic Southern cheese punch, both inside and sprinkled on top.
1 teaspoon salt: Elevates and balances the natural flavors of the squash and cheese.
1/2 teaspoon black pepper: Adds a mild spice to give the dish a subtle kick.
1 sleeve Ritz crackers (crushed, about 30 crackers): Creates a buttery, crispy topping that makes every bite a delight.

How to Make Southern Squash Casserole Recipe

Step 1: Sauté the Squash and Aromatics

Start by preheating your oven to 350 degrees Fahrenheit, setting the stage for a warm, cozy casserole. Melt half the butter in a large skillet over medium heat, then toss in the sliced yellow squash, diced onion, and minced garlic. Sauté this mixture for 8 to 10 minutes, stirring occasionally, until the squash becomes tender and the onion looks translucent. This step brings out the natural sweetness and softens the veggies for the ultimate texture in your casserole.

Step 2: Drain and Dry the Squash

Pour the cooked squash mixture into a strainer and let it drain for about 5 minutes to remove excess moisture. For the best consistency in your casserole, gently pat the squash dry with paper towels afterward. Removing the liquid ensures your casserole won’t be watery but perfectly creamy and firm instead.

Step 3: Mix the Creamy Base

In a large bowl, whisk together the sour cream, mayonnaise, beaten egg, half of the shredded cheddar cheese, salt, and black pepper. This creamy base is the secret to making your Southern Squash Casserole Recipe irresistibly rich, tangy, and full of savory warmth.

Step 4: Combine Squash and Creamy Mixture

Gently fold the drained squash mixture into your creamy egg and cheese blend, being careful not to overmix. This method helps keep the squash tender and all ingredients evenly coated, ensuring every bite is bursting with flavor and texture.

Step 5: Assemble and Add the Topping

Spread the squash mixture evenly into a greased 8×8-inch baking dish. In a separate bowl, melt the remaining butter and stir it together with the crushed Ritz crackers and the leftover shredded cheddar. Sprinkle this delicious topping evenly over the casserole, adding that golden, buttery crunch that makes this recipe a standout every time you make it.

Step 6: Bake to Perfection

Place your assembled casserole in the preheated oven and bake for 25 to 30 minutes, or until the top is beautifully golden brown and bubbly around the edges. Let it rest for 5 to 10 minutes before serving—this little pause allows the flavors to settle and the casserole to firm up slightly for the perfect slice.

How to Serve Southern Squash Casserole Recipe

A close-up of a round fried slice held by a fork shows a golden, crispy outer layer with a slightly crumbly texture. Inside, the slice reveals a creamy, light yellow filling with small pieces of white and slightly browned bits nestled within. Below, more pieces of the same fried slices form a textured, uneven pile with a mix of golden crust and creamy filling visible. The scene is set on a white marbled surface, with soft natural lighting enhancing the warm yellow and cream colors of the food. photo taken with an iphone --ar 4:5 --v 7

Garnishes

Sprinkle freshly chopped parsley or chives on top for a burst of color and fresh, herbaceous flavor. A light dusting of smoked paprika can also add a hint of warmth and vibrant red hue that makes the dish visually stunning and taste even better.

Side Dishes

This Southern Squash Casserole pairs wonderfully with classic dishes like fried chicken, barbecue ribs, or a simple grilled steak. For a lighter balance, serve alongside a crisp green salad or steamed green beans to add freshness and crunch to your meal.

Creative Ways to Present

For an elegant twist, portion the casserole into individual ramekins or small skillets before baking. This personal touch makes each serving feel special and ideal for gatherings. Alternatively, add layers of sautéed mushrooms or bacon bits inside the casserole for unique flavor dimensions that elevate this beloved recipe even further.

Make Ahead and Storage

Storing Leftovers

Once your Southern Squash Casserole has cooled, cover it tightly with plastic wrap or foil and store it in the refrigerator. It will stay fresh for up to 3 days, making it perfect for easy, ready-made meals throughout the week.

Freezing

You can freeze this casserole before baking by covering it tightly in a freezer-safe dish or wrapping it well with foil and plastic wrap. When you’re ready to enjoy, thaw it overnight in the fridge and bake as directed. Freezing is a fantastic way to prep ahead without losing any of that wonderful flavor.

Reheating

Reheat leftovers in the oven at 325 degrees Fahrenheit for 15-20 minutes, or until warmed through and the topping regains that crisp texture. Avoid microwaving if possible, to preserve the crunch of the Ritz topping and the creamy interior texture.

FAQs

Can I use frozen squash instead of fresh in this Southern Squash Casserole Recipe?

While fresh squash offers the best texture and flavor, you can use frozen squash if needed. Just make sure to thaw and drain it very well to remove excess moisture, as too much liquid can make the casserole watery.

Is there a substitute for Ritz crackers in the topping?

Absolutely! You can substitute crushed buttery breadcrumbs or panko mixed with a bit of melted butter for a similar crunchy top. Just keep in mind that Ritz crackers add a distinct buttery flavor unique to this dish.

Can I make this recipe dairy-free?

To make a dairy-free version, choose non-dairy alternatives like vegan mayo and sour cream, and swap the cheddar for a plant-based cheese. Use a dairy-free butter substitute for sautéing and the topping. The texture will be slightly different, but still delicious.

How spicy is this casserole?

This Southern Squash Casserole Recipe is mild and comforting with just a hint of black pepper for subtle warmth. It’s family-friendly and suitable for all taste preferences, though you can add a pinch of cayenne pepper if you want to spice it up a bit.

Can I double this recipe for a larger crowd?

Yes! Simply double all ingredients and bake the casserole in a larger dish, or use two 8×8 pans. Keep an eye on the baking time, as a larger casserole might need a few extra minutes to heat through evenly.

Final Thoughts

There’s something truly special about making and sharing Southern comfort food, and this Southern Squash Casserole Recipe fits right into that heartfelt tradition. It’s easy to make, full of flavor and texture, and just perfect for family dinners or holiday gatherings. Don’t hesitate to give it a try—you might just find your new favorite side dish that everyone will ask for again and again.