Ana

Ana is a Southern stay-at-home mom of three who bakes the way most people breathe — constantly, naturally, without making a fuss about it. She shows up at new neighbors’ doors with a tin of cookies before the boxes are even unpacked, and she has never once come home from a potluck with anything left in her dish. She Brings Food is where she puts the recipes her family counts on and her neighbors keep asking for.

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Southern Yellow Squash Casserole

by Ana | Casseroles, Sides & Salads, Southern Sides

I have served this to people who told me, before sitting down, that they don’t like squash. They had seconds. I noted it quietly and didn’t say a word. That is the kind of victory worth tracking.

Southern Yellow Squash Casserole is the vegetable dish that gets seconds even from people who don’t consider themselves vegetable people. It’s warm, it’s creamy, it’s savory in the way only a proper Southern casserole can be — and the cracker topping bakes up golden and slightly salty in a way that makes you wonder why you don’t put crackers on more things.

This is easy squash casserole done the right way — yellow squash cooked down with sweet onion until tender, folded into a creamy, cheesy sauce, and topped with buttered crackers before going into the oven. The summer squash casserole that belongs at every cookout, every potluck, and every weeknight dinner where you need a side dish that actually pulls its weight at the table.

My neighbor knocked on my door after the first time I brought this to a summer cookout. She wanted the recipe. I gave it to her. She’s made it every summer since. That’s how it goes with the dishes that actually work.

Why This Recipe Works

Yellow squash has a high water content, which is the main challenge. Cook it too quickly and that water stays in the casserole and makes everything soupy. The key is cooking the squash down properly before mixing — long enough that excess moisture releases and evaporates into the pan, leaving you with tender, concentrated squash that blends into the sauce without thinning it.

The sweet onion cooked alongside the squash adds a background sweetness that deepens the overall flavor. The cream of mushroom soup base keeps this accessible and reliably good without demanding technique — what makes it a great Southern squash casserole is the ratio of squash to sauce, and the buttered cracker topping that crisps in the oven while the casserole bubbles beneath it. Even squash skeptics don’t stand a chance.

Ingredients

For the Casserole

2 lbs yellow squash, sliced into ¼-inch rounds
1 medium sweet onion, diced
2 tablespoons unsalted butter
1 can (10.5 oz) cream of mushroom soup
½ cup sour cream
1 cup shredded sharp cheddar, divided
2 large eggs, beaten
Salt and black pepper to taste
¼ teaspoon garlic powder

For the Cracker Topping

1 sleeve Ritz crackers (about 35 crackers), crushed
3 tablespoons unsalted butter, melted
Salt to taste

How to Make It

1 Cook down the squash and onion

Melt butter in a large skillet over medium heat. Add squash, onion, salt, and pepper. Cook for 12–15 minutes, stirring occasionally, until squash is very tender and most of the liquid has evaporated. Don’t rush this step — the moisture needs to leave the pan or the casserole will be watery.

2 Make the filling

Preheat oven to 350°F. In a large bowl, combine cream of mushroom soup, sour cream, ¾ cup of the cheddar, beaten eggs, and garlic powder. Season with salt and pepper. Fold in the cooked squash mixture until evenly combined.

3 Transfer and top

Pour filling into a greased 9×13 baking dish. Sprinkle remaining ¼ cup cheddar over the top. Combine crushed crackers with melted butter and a pinch of salt, then scatter evenly over the casserole.

4 Bake

Bake for 30–35 minutes until the casserole is bubbling at the edges and the cracker topping is deep golden brown. Let rest 10 minutes before serving.

Things I’ve Learned From Making This Too Many Times to Count

Cook the squash all the way down. When you think it’s done, give it two more minutes. The excess water is what makes casseroles soupy, and the stovetop is where you get rid of it. Bless the people who skip this step — they know not what they do.

Let the cooked squash cool slightly before mixing. Adding hot squash to the egg mixture risks scrambling the eggs. Five minutes off the heat is enough. Mix quickly once you combine.

Use sharp cheddar, not mild. The sharpness provides contrast to the naturally sweet squash and the slightly sweet cracker topping. Mild cheddar disappears into the casserole. Sharp cheddar is present.

Crush the crackers, don’t pulverize them. Larger cracker pieces give the topping more texture. Very fine crumbs compact and don’t crisp as well. Aim for irregular pieces ranging from coarse crumbs to small chunks.

Season each layer. Salt the squash while it cooks, season the filling mixture, and salt the cracker topping. Each layer seasoned separately means the whole dish tastes balanced all the way through.

This reheats beautifully. Cover with foil and reheat at 325°F for 20 minutes. The cracker topping softens slightly but the casserole itself holds up very well for a day or two after baking.

What to Serve With Southern Yellow Squash Casserole

This side dish belongs next to grilled chicken, pork chops, or any summer cookout spread. It pairs naturally with green bean casserole, corn pudding, and cornbread at any Southern table. The mild sweetness of the squash makes it versatile alongside almost any protein.

For summer suppers, this casserole alongside sliced garden tomatoes and grilled chicken is a complete meal that requires almost no thought. My family considers it a seasonal staple — it appears every time the summer garden starts producing more squash than we can eat any other way. I’ve made this dish more times than I can count, and it has never once disappointed.

Variations Worth Trying

With zucchini: Substitute half the yellow squash with zucchini for a mixed squash casserole. The two squashes have similar textures and the color variation is visually appealing.

With peppers: Add one diced bell pepper (any color) to the onion and squash as they cook. The pepper adds sweetness and a pop of color. Red or orange peppers are particularly good here.

With Parmesan topping: Mix ¼ cup grated Parmesan into the cracker crumbs before topping. The Parmesan adds a salty, nutty note to the crust that works especially well with the mild squash filling.

Without the soup: Replace the cream of mushroom soup with a homemade white sauce — 2 tablespoons butter, 2 tablespoons flour, 1 cup milk, cooked until thick. The from-scratch version has a cleaner flavor. Use what you’ve got — this recipe has manners, it won’t fuss.

Storage and Reheating

Cover and refrigerate for up to 4 days. Reheat covered with foil at 325°F for 20–25 minutes. The cracker topping softens when stored — for best texture, add a handful of freshly buttered crushed crackers to the top before reheating and leave uncovered for the last 5 minutes.

Freezing is possible but the texture of the squash changes slightly — it softens further after thawing. For best results, eat this within a few days of baking. It holds well enough that this is rarely a problem.

FAQ

How do I prevent squash casserole from being watery?

Two strategies: cook the squash longer on the stovetop to release more moisture before mixing, and make sure to drain off any liquid that pools in the pan. Additionally, you can salt the sliced squash, let it sit 15 minutes, then squeeze out excess moisture before cooking. Both steps together produce the driest, richest filling.

Can I make squash casserole the night before?

Prepare through step 3 and refrigerate unbaked, covered. Add the cracker topping right before baking so it doesn’t absorb moisture overnight. Bake from cold and add 10 extra minutes to the bake time.

Can I substitute cream of chicken soup for cream of mushroom?

Yes — cream of chicken works well and produces a slightly different but equally good flavor. The mushroom soup adds earthiness that complements the squash nicely, but cream of chicken is a perfectly solid substitute.