Easy Squash Casserole with Ritz Crackers

There’s something special about a warm Southern casserole coming out of the oven with a golden, buttery cracker topping. This squash casserole with Ritz crackers is creamy in the middle, crisp on top, and packed with tender yellow squash, melted cheddar, and simple comforting flavors.

It’s the kind of side dish that feels right at home at a Sunday dinner, summer cookout, Thanksgiving table, or family gathering. And while squash naturally contains plenty of moisture, a few simple preparation tricks keep this casserole creamy instead of watery.

Best of all, you don’t need canned soup to make it. A simple mixture of sour cream, egg, cheddar cheese, and seasonings gives the casserole plenty of richness while letting the fresh squash remain the star.

Why You’ll Love This Squash Casserole

This recipe turns inexpensive yellow squash into a comforting side dish that feels special enough for holidays but is easy enough for an everyday dinner.

The buttery Ritz cracker topping gives every serving a delicious contrast between the creamy filling and crispy top. Cheddar adds richness, while sautéed onion brings a little sweetness and depth.

It’s also a great recipe when your garden—or the farmers’ market—is overflowing with summer squash.

Another advantage is that most of the ingredients are easy to find at a regular grocery store, and the casserole can be partially prepared ahead of time when you’re cooking for a crowd.

If your family loves creamy baked dinners, my Easy Chicken and Vegetable Casserole is another simple casserole to add to your weekly rotation.

Ingredients You’ll Need

You only need a handful of familiar ingredients to make this easy squash casserole.

Yellow squash: Fresh yellow summer squash is the foundation of the recipe. Choose firm squash without soft spots.

Onion: Adds savory flavor and a subtle sweetness as it cooks with the squash.

Butter: Used for cooking the vegetables and creating the buttery Ritz cracker topping.

Sour cream: Gives the filling its creamy texture without requiring condensed soup.

Egg: Helps bind the casserole together so it holds its shape better when served.

Cheddar cheese: Sharp cheddar gives the casserole plenty of flavor. Freshly shredded cheese melts especially well.

Ritz crackers: Crushed buttery crackers create the classic crispy topping.

Garlic powder: Adds flavor without overpowering the squash.

Salt and black pepper: Simple seasoning is all this casserole really needs.

What Kind of Squash Is Best for Squash Casserole?

Yellow summer squash is the best choice for this recipe. It has a mild flavor and becomes tender quickly when cooked.

Look for small to medium squash whenever possible. Very large squash can contain more seeds and water, which isn’t ideal for casserole.

You can also combine yellow squash with zucchini, although the finished casserole will look and taste slightly different.

There’s no need to peel yellow squash. The skin becomes tender during cooking and helps the slices maintain some structure.

How to Make Squash Casserole with Ritz Crackers

The recipe is straightforward, but how you prepare the squash makes a big difference in the final texture.

1. Prepare the Squash

Wash the yellow squash and cut it into approximately ¼-inch slices. Thin, relatively even slices will cook at about the same rate.

Dice the onion while you prepare the squash.

2. Cook the Vegetables

Melt butter in a large skillet over medium heat.

Add the sliced squash and onion and cook for about 8–10 minutes, stirring occasionally, until the vegetables are tender but not completely falling apart.

The squash will release moisture as it cooks. That’s completely normal.

3. Drain the Squash Well

Transfer the cooked squash and onion to a colander and let them drain for 5–10 minutes.

This is one of the most important steps in the recipe.

Gently pressing the vegetables with the back of a spoon can help release additional moisture, but don’t mash the squash.

4. Make the Creamy Filling

In a large mixing bowl, combine the sour cream, egg, garlic powder, salt, black pepper, and most of the shredded cheddar.

Add the drained squash and onion and gently fold everything together.

5. Assemble the Casserole

Transfer the squash mixture to a lightly greased baking dish and spread it into an even layer.

Sprinkle the remaining cheddar over the top.

6. Add the Ritz Cracker Topping

Crush the Ritz crackers into coarse crumbs.

Combine the crushed crackers with melted butter and sprinkle the mixture evenly over the casserole.

You want some larger cracker pieces rather than turning everything into fine crumbs. Those pieces create a better crunchy texture after baking.

7. Bake

Bake at 350°F (175°C) until the casserole is hot and bubbling around the edges and the Ritz cracker topping is beautifully golden.

Let it rest for several minutes before serving. This gives the creamy filling a little time to settle and makes the casserole easier to portion.

How to Keep Squash Casserole from Getting Watery

If you’ve ever made squash casserole and found liquid collecting at the bottom of the baking dish, you’re not alone.

Yellow squash naturally contains a lot of water.

The easiest solution is to cook and drain the squash before assembling the casserole.

After sautéing the squash and onion, leave them in a colander for about 5–10 minutes. This allows excess liquid to escape before the vegetables meet the creamy filling.

Avoid skipping this step, even when you’re in a hurry.

You should also avoid overloading the filling with additional liquid ingredients. The sour cream and egg provide enough moisture and richness without making the casserole soupy.

Emily’s Tips for the Best Squash Casserole

Don’t overcook the squash in the skillet. It will continue cooking in the oven, so you want it tender but still able to hold its shape.

Drain it thoroughly. This is probably the most important tip in the entire recipe. Removing excess moisture before assembling the casserole helps prevent a watery filling.

Shred your own cheddar when possible. Freshly shredded cheese melts smoothly into the filling and gives the casserole a rich, cheesy texture.

Keep the crackers coarse. A mixture of crumbs and small cracker pieces produces a more interesting crunchy topping.

Watch the topping near the end. Ritz crackers can brown quickly once they’re coated in butter, so keep an eye on the casserole during the final minutes.

Easy Variations

Once you know the basic recipe, there are several easy ways to adapt it.

For a zucchini and squash casserole, replace part of the yellow squash with sliced zucchini. Just remember to cook and drain the zucchini well too.

For additional savory flavor, add a little onion powder or dried thyme to the filling.

You can also substitute Monterey Jack for some of the cheddar if you prefer a milder cheese.

If you like extra crunch, increase the amount of Ritz cracker topping slightly.

For a touch of heat, add a small pinch of cayenne pepper or crushed red pepper flakes.

What to Serve with Squash Casserole

This casserole works especially well as a side dish because its creamy texture complements simple roasted or grilled proteins.

Serve it alongside roasted chicken, grilled chicken, turkey, baked fish, or a simple beef dinner.

For a comforting casserole-style family dinner, you can also pair it with dishes such as my Easy Marry Me Chicken Casserole, made with chicken, pasta, sun-dried tomatoes, spinach, and a creamy Parmesan sauce.

Squash casserole also fits beautifully into a larger holiday spread with mashed potatoes, green beans, roasted vegetables, and dinner rolls.

Because yellow squash is abundant during warmer months, this recipe is also a natural choice for summer potlucks, barbecues, and family cookouts.

Can You Make Squash Casserole Ahead of Time?

Yes. This is a convenient casserole to partially prepare ahead of time, especially when you’re planning a holiday dinner or feeding a crowd.

Prepare the squash mixture and transfer it to your baking dish. Cover the dish and refrigerate it.

Keep the Ritz cracker topping separate so the crackers stay crisp.

When you’re ready to bake, add the remaining cheese and buttery cracker topping before placing the casserole in the oven.

If the casserole goes directly from the refrigerator into the oven, it may need a few additional minutes to heat completely through.

How to Store Leftover Squash Casserole

Allow the leftover casserole to cool, then transfer it to an airtight container or cover the baking dish tightly.

Refrigerate leftovers promptly and use them within 3–4 days.

For safe storage, the USDA recommends keeping refrigerated foods at 40°F (4°C) or below.

The Ritz topping will soften somewhat in the refrigerator, but reheating the casserole in the oven can help restore some of its texture.

How to Reheat Squash Casserole

For the best texture, reheat leftover squash casserole in a 350°F (175°C) oven until it is heated through.

If the topping is already nicely browned, loosely cover the casserole with foil during part of the reheating time to keep the crackers from becoming too dark.

For individual portions, the microwave works too, although the Ritz cracker topping won’t remain as crisp.

Can You Freeze Squash Casserole?

You can freeze squash casserole, but there is one thing to keep in mind: summer squash has a high water content, so its texture may become softer after freezing and thawing.

If you plan to freeze the casserole, assemble it without the Ritz cracker topping.

Wrap the casserole tightly and freeze it for up to about 2 months.

When you’re ready to serve it, thaw it overnight in the refrigerator and add a fresh buttery Ritz topping before baking.

For the best overall texture, though, I prefer making this casserole fresh or preparing it one day ahead rather than freezing it.

Frequently Asked Questions

Do You Peel Yellow Squash Before Making Casserole?

No. Yellow summer squash has tender, edible skin, so peeling isn’t necessary.

Simply wash the squash well, trim the ends, and slice it before cooking.

Why Is My Squash Casserole Watery?

The most common cause is excess moisture from the squash.

Yellow squash releases water as it cooks, which is why sautéing and thoroughly draining it before assembling the casserole is so important.

Give the cooked vegetables 5–10 minutes in a colander before adding them to the creamy filling.

Can I Use Zucchini Instead of Yellow Squash?

Yes.

You can replace some or all of the yellow squash with zucchini. The flavor and appearance will change slightly, but the same basic method works.

Make sure you cook and drain the zucchini well because it also contains plenty of moisture.

Can I Make Squash Casserole Without Ritz Crackers?

Yes.

Another buttery cracker can work as a substitute, or you can use breadcrumbs for a different style of topping.

However, Ritz crackers give this version its classic buttery flavor and crispy finish.

Can I Prepare Squash Casserole the Night Before?

Yes.

Prepare the filling and place it in the baking dish, then cover and refrigerate it overnight.

Keep the Ritz cracker mixture separate and add it just before baking so the topping doesn’t absorb moisture while sitting in the refrigerator.

Is Squash Casserole a Main Dish or Side Dish?

Squash casserole is typically served as a side dish.

Its creamy, cheesy flavor pairs particularly well with chicken, turkey, beef, and fish, making it useful for both everyday family dinners and larger holiday meals.

A Classic Southern Side Dish Worth Making Again

This squash casserole with Ritz crackers proves that simple vegetables can become serious comfort food.

Tender yellow squash, creamy cheddar filling, and a golden buttery cracker topping come together in an easy side dish that works for weeknight dinners, summer gatherings, potlucks, and holiday tables.

And once you know the simple trick of cooking and thoroughly draining the squash first, it’s easy to get that creamy casserole texture without a watery bottom.

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