Summer Squash Casserole

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A beloved dish throughout the South, Summer Squash Casserole brings comfort and flavor to the table with minimal effort. This version skips the mayo and leans into creamy textures, rich cheese, and a crunchy, buttery cracker topping. It’s a great way to use up extra squash and always disappears fast at gatherings.

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This casserole is my go-to when squash is overflowing in the kitchen. It’s simple enough for weeknight dinners yet nostalgic enough for holiday spreads. Whether you’re serving it with ham at Easter or bringing it to a summer potluck, it’s always a crowd-pleaser.

The base of the dish is yellow squash—tender, mild, and perfect for baking. The combination of creaminess and crunch makes this dish impossible to resist.

History

Squash Casserole is a Southern classic that became a staple in American home cooking between the 1920s and 1950s. While squash has been cultivated in North America for thousands of years, the creamy, baked casserole version likely emerged in the early 20th century as casseroles grew in popularity during the Great Depression and post-war era. Combining tender yellow squash with eggs, cheese, and a buttery cracker or breadcrumb topping, this dish became a favorite at potlucks, church suppers, and holiday tables. Its affordability, comforting texture, and simple preparation helped secure its place in Southern culinary tradition.

Ingredients

• Yellow squash – Use yellow summer squash or yellow zucchini if you can’t find summer squash.
• Sweet onion – Vidalia is ideal for its mellow flavor.
• Salted butter – I use salted butter for flavor, though unsalted works if you adjust the seasoning.
• Cream of mushroom soup – I prefer the low-sodium option to manage the salt content.
• Cream cheese – Let it sit at room temp for easy mixing.
• Egg – You can use large or extra large eggs.
• Sharp cheddar cheese – I prefer to shred my own.
• Salt – I cook with kosher salt.
• Freshly ground black pepper – Freshly cracked black pepper has the best flavor.

Topping

• Crackers – A flaky, buttery cracker like Ritz works best.
• Butter – Yes, more butter. This isn’t a diet friendly recipe. Eat a smaller portion if you’re worried.

How to Make Summer Squash Casserole

Scroll down for the full recipe card with exact measurements and printable instructions.

Preheat your oven to 375°F and lightly grease a 2-quart casserole dish with nonstick spray.

Wash and slice the squash into ⅓-inch rounds and place them in a large mixing bowl. I like using a mandoline slicer here so every slice is uniform and cooks evenly.

Over medium heat, sauté the diced onion in butter until softened, about 5 to 6 minutes. Add the cream cheese and stir until it melts into a smooth, creamy mixture. A mini silicone whisk makes this step quick and ensures there are no lumps.

In a mixing bowl, combine the onion and cream cheese mixture with the cream of mushroom soup, egg, half of the shredded cheddar cheese, salt, and pepper.

Pour this creamy mixture over the squash and gently toss until each piece is coated evenly. I like using a large silicone spatula to fold without mashing the squash.

Transfer the squash mixture to the prepared baking dish and spread it out evenly.

Crush the crackers in a zip-top bag using a rolling pin or a small meat mallet. Combine the crushed crackers with the remaining cheddar cheese and melted butter, then sprinkle evenly over the top of the casserole.

Bake for 20 to 25 minutes, until the casserole is bubbly and the topping is golden brown.

Serve warm and enjoy the creamy, cheesy goodness with a perfect crunch on top.

Chef Jenn’s Tips

• Got oversized squash? Slice them lengthwise and remove some seeds with a spoon before cutting into rounds.
• Want to prep it early? Assemble the casserole without the topping, refrigerate, then top and bake when ready. If baking straight from the fridge, add a few extra minutes to the cook time.

Make It A Meal

This casserole is a perfect partner for roasted pork, grilled chicken, or even fried fish. Round out the meal with a crisp green salad or juicy tomatoes. It’s also delicious paired with a slice of cornbread or served next to leftover fried chicken.

Storage

Leftovers can be stored in an airtight container in the fridge for up to 4 days. Reheat in the oven at 350°F or microwave individual portions. If freezing, assemble the casserole without the topping, wrap tightly, and freeze for up to 2 months. When ready to bake, thaw in the fridge, add the topping, and cook as directed.