Skip to Content

Yellow Squash Casserole Recipe

*This post may contain affiliate links. As Amazon Associates we earn from qualifying purchases.

Our yellow squash casserole recipe features perfectly cooked yellow squash combined with two kinds of cheese, a sour cream sauce, and sweet yellow onions.

Yellow squash sauteed with sweet onions and then baked in a cheesy sour cream sauce. Sounds pretty good, right? I’ve cooked a lot of squash recipes in my kitchen adventures but never one like this.

In fact, I had never eaten a squash casserole until Kim made her version. The buttery topping adds a nice crunchy texture to offset the creamy casserole filling.

If you wanted to add a kick to the recipe, I feel red pepper flakes would be a nice addition. All in all, this recipe is a keeper and I’m pleased to share it with our readers.

Now, let’s get in the kitchen and start cooking!

The yellow squash casserole, topped with a crunchy cracker crust.

Squash Casserole Instructions:

First things first, you’ll need to preheat your oven to 350°F. and prepare a two (2) quart casserole dish. By prepare, I mean grease it with butter or use a non-stick cooking spray.

After that, start slicing your yellow squash and sweet onions. Personally, I feel like Vidalia onions would be amazing in this casserole.

Once that’s done, crumble up your crackers and measure out the rest of the ingredients.

The oil, squash, and onions cooking in a large skillet.

Next, go ahead and toss the olive oil, squash, and onions into a large skillet or saute pan.

Cook them over medium heat for about three (3) to five (5) minutes, or until the veggies are soft.

The veggies in a bowl tossed with the filling ingredients.

Afterward, while the squash cools, combine the sour cream, cheddar cheese, Parmesan cheese, and salt and pepper. Use a large mixing bowl for blending these ingredients.

Because, once they’re mixed you going to add the onions and squash to the rest of the filling ingredients. Now, use tongs to toss everything together.

The mixture has been put in a casserole dish for baking.

Then, transfer the mixture to your casserole dish. Using a separate small bowl, mix together the crumbled crackers and additional Parmesan cheese.

Sprinkle this concoction over the casserole and drizzle the melted butter over the crunchy topping.

A big scoop of the squash being lifted from the finished casserole.

Place the casserole dish into your oven to bake for about thirty (30) minutes or until the crust is golden brown. Take a look at the photo above as a reference.

Last remove the yellow squash casserole from the oven and let it cool for approximately fifteen (15) minutes before serving. That’s it, your squash casserole recipe is done.

Kim and I hope you enjoy this offering from Berly’s Kitchen, LLC. Furthermore, we hope you have a wonderful day 🙂

Can’t get enough casserole? Then try our Chile relleno casserole made with roasted pablano peppers or our Corn Casserole made with two kinds of corn, butter, and sour cream!

Two plates of the finished casserole ready to be served.

Yellow Squash Casserole Recipe Tips:

There are all kinds of crackers you can use as a topping for this recipe. For example, we chose butter crackers; however, saltines work well with this recipe too.

Also, you don’t have to use crackers, bread crumbs or ground chips might make wonderful substitutions.

Yellow isn’t the only kind of squash to choose for this dish. Try using zucchini as the base and adding things like bell peppers or green chilies.

The point is, don’t let your creativity or imagination be bound to a recipe. Figure out what kind of squash grows seasonally in your area and try it instead.

Side dishes like this one are a great way to get children accustomed to the taste of fruits and vegetables. Don’t be afraid to make meals like this for little kids.

Teach your children that when prepared correctly, fruits and veggies can be nutritious and tasty.

If you liked our yellow squash casserole recipe, please leave us a comment and rate the recipe card. You can also find on my Facebook, Pinterest, Twitter, and Instagram by searching for Berly’s Kitchen!

Join our Facebook group for more recipes from Berly’s Kitchen, our new site More Than Meat and Potatoes, and some of our blogger friends!

A big scoop of the squash being lifted from the finished casserole.

Yellow Squash Casserole Recipe

Yield: 10 Servings
Prep Time: 20 minutes
Cook Time: 35 minutes
Time to Cool: 15 minutes
Total Time: 1 hour 10 minutes

Our yellow squash casserole recipe features perfectly cooked yellow squash combined with two kinds of cheese, a sour cream sauce, and sweet yellow onions.


Squash Casserole Filling

  • 1 Tablespoon Olive Oil
  • 4 Medium Yellow Squash, (sliced into thin circles)
  • 1 Cup Sweet Onions, (thinly sliced)
  • 1 Cup Sour Cream
  • 1 Cup Cheddar Cheese, (shredded)
  • 1/2 Cup Parmesan Cheese, (shredded or grated)
  • 1/2 Teaspoon Salt, (or to taste)
  • 1/2 Teaspoon Black Pepper, (or to taste)


  • 25 Small Crackers, (approximately one ((1)) sleeve, crumbled)
  • 1/4 Cup Parmesan Cheese, (shredded or grated)
  • 2 Tablespoons Unsalted Butter, (melted)


  1. Preheat the oven to 350 degrees, and lightly grease a 2-quart baking dish.
  2. In a large skillet, heat the olive oil over low-medium heat. Add the squash and onions, and cook until they begin to soften slightly (about 4-5 minutes). Remove from heat.
  3. Combine the cheddar cheese, Parmesan cheese, sour cream, salt, and pepper in a large bowl. Add the squash and onions, and stir to coat.
  4. In a separate small bowl, crush the crackers. Then add the Parmesan cheese, and stir to combine.
  5. Transfer the squash mixture to the prepared baking dish. Top with the cracker mixture, and drizzle with melted butter.
  6. Place the casserole into the oven, and bake for 30 minutes or until the top is golden brown and the filling is bubbly.
  7. Remove from oven and allow the casserole to cool for 10-15 minutes before serving.


The calories listed are an approximation based on the ingredients and a serving size of about one (1) cup of the squash casserole. Actual calories will vary. The casserole can be stored in a sealed container, in your fridge, for up to three (3) days.

Recommended Products

As an Amazon Associate and member of other affiliate programs, I earn from qualifying purchases.

Nutrition Information:
Yield: 10 Serving Size: 1 Cup
Amount Per Serving: Calories: 207Total Fat: 16gSaturated Fat: 8gUnsaturated Fat: 0gCholesterol: 35mgSodium: 414mgCarbohydrates: 10gFiber: 1gSugar: 4gProtein: 8g

Don't forget to follow us on Pinterest!

Share this recipe by clicking the Pinterest button below!

Italian hoagie dip in a white bowl.
Italian Hoagie Dip Recipe
← Read Last Post
Two plates of the chicken broccoli rice topped with cheddar.
Instant Pot Chicken Broccoli Rice
Read Next Post →

Subscribe for Weekly Emails

* indicates required
Email Format