Fabulous Yellow Squash Casserole Recipe

There's just something about yellow squash that is oh-so-amazing, despite the humble origins of this vine-grown fruit. Not only does it taste really good, but the thin yellow skin also make them very aesthetically pleasing. This means that yellow squash can help make a great dish that will really wow a crowd. 

Now, when most people think of casseroles, they think of Thanksgiving. And this casserole recipe would be certainly suited to the occasion, but why stop there? This fabulous yellow squash casserole is also great for a summer side dish, a cookout, a hearty family dinner, and pretty much any other occasion where you're feeding a crowd. Another major plus is that it requires just 5 minutes of prep time and only a handful of ingredients.

Recipe developer Angela Latimer of Bake it With Love is the brains behind this scrumptious side dish that screams nostalgia for her and many others. "Yellow squash is one of my 'things' that I truly love to eat. My Grandma always grew a big tangle of yellow squash in her yard so it's a bit of a childhood memory thing for me," she shares. We love a dish with deep roots that brings the family back together! Here's how to get started with your own culinary memories, courtesy of this yellow squash casserole.

Gather the ingredients

The first thing you need to do for this simple dish is round up everything needed to make it, of course, though chances are good that you already have some of the items already waiting in your home kitchen. The main ingredient here is, naturally, yellow squash, sometimes also referred to as summer squash. You will need either 6 small squash or 4 medium-sized ones based on what you can find at the grocery store. In addition, add sour cream, large eggs (at room temperature), and dried minced onion to your grocery list. 

Next, the recipe calls for a few spices, including fresh thyme, salt, and black pepper. These three things will add some serious flavor to your finished casserole. Cheddar cheese is the last thing that you will need for the casserole itself.

As far as the topping goes, it's as simple as can be. All you need to get is panko breadcrumbs for a bit of crunch, in addition to butter and garlic salt. Last but not least are two optional items that you can also mix into the crunchy breadcrumb topping in a few steps: Parmesan cheese and fresh chopped parsley.

Preheat your oven and prep the squash

Before you do anything else, preheat your oven to 350 F to ensure that it's fully up to heat and ready to go when you need to bake the casserole. Next, take out a 2-quart casserole dish or a 9x13-inch baking pan, whichever one you prefer or have available in your kitchen. Spray your dish of choice with nonstick cooking spray or lightly oil it by hand. This will ensure that none of the good stuff sticks to the pan when it comes time to serve up the casserole. Trust us, you won't want to waste a single bite.

Once you preheat the oven, wash the yellow squash. Then, take out a cutting board and slice each one into thin, round pieces. After that, place the prepared slices into a large mixing bowl. Set it to the side, but not too far away, as you'll need the squash in just a moment.

Make the filling

Now, it's time to make the filling that quite literally holds the casserole together and also happens to taste great. To make the mix, you need a medium mixing bowl, where's you'll toss in your sour cream, eggs, dried onion, fresh thyme, salt, and pepper. Mix to combine. Then, fold in the grated cheese and stir well. Now it's time to pour the mixture over the sliced yellow squash waiting in its nearby bowl.

Mix all of the ingredients well so the sour cream mixture gets on every piece of the sliced yellow squash. Then transfer this mixture to your prepared baking dish. Set the dish to the side for the time being while you make the topping for the casserole.

Mix the topping

To make the casserole topping, you just need a small bowl. This topping provides a perfect little crunch in a coating that takes your casserole from amazing to truly out-of-this-world. First, combine the panko breadcrumbs with melted butter and garlic salt. If you opt to use the Parmesan cheese and freshly chopped parsley, you can also fold in one tablespoon of each at this time. Mix everything well so it's evenly distributed.

Now it's time for the mix to meet the squash. Sprinkle the panko topping over the baking dish, making sure you hit every piece so it's evenly spread across the top of the assembled slices. Now, it's time to pop this baby on the middle rack of your oven.

Bake and enjoy

Set your timer for 30 to 35 minutes and continue to check the casserole in case it gets done a little sooner than anticipated — remember that your individual oven can be a little different from another, so it's always a good idea to keep an eye on things toward the end of the baking process. When the cheese melts and starts to bubble, that's another indicator that the casserole is ready. You can also turn on the broil option on your oven for the last few minutes so your crust gets that nice golden-brown color. When the casserole has achieved that color, remove the dish from the oven. Please note that it's best when served immediately, to take advantage of the freshly cooked squash and warm, savory flavor. 

As far as pairing options, there are a lot of options at your dispoal. "This is a wonderful side for practically any protein," Latimer shares. "My personal faves are chicken (and turkey) so yes they would be fabulous with bbq or as part of a holiday meal." Enjoy! 

Fabulous Yellow Squash Casserole Recipe
5 from 726 ratings
Here's how to get started with making some of your own homegrown culinary memories, courtesy of this delicious, crispy, and cozy yellow squash casserole.
Prep Time
Cook Time
Fabulous Yellow Squash Casserole in dish
Total time: 35 minutes
  • 6 small yellow squash, thinly sliced
  • ½ cup sour cream
  • 2 large eggs, room temperature
  • 1 tablespoon dried minced onion
  • 1 teaspoon fresh thyme
  • ½ teaspoon salt
  • ¼ teaspoon pepper
  • 1 cup grated cheddar cheese
  • ¾ cup panko breadcrumbs
  • 2 tablespoon butter, melted
  • 1 teaspoon garlic salt
Optional Ingredients
  • 1 tablespoon Parmesan cheese
  • 1 tablespoon fresh chopped parsley
  1. Preheat your oven to 350 degrees F. Lightly grease or spray a 2-quart casserole dish or 9x13-inch baking pan with non-stick cooking spray.
  2. Wash and thinly slice the yellow squash. Place the slices into a large mixing bowl.
  3. In a medium mixing bowl, combine the sour cream, eggs, dried minced onion, fresh thyme, salt, and pepper. Fold in grated cheese then pour over the sliced yellow squash. Mix to combine.
  4. Transfer the squash and cheese mixture into the prepared baking dish.
  5. In a small bowl, combine panko breadcrumbs with the melted butter and garlic salt, plus parmesan and fresh parsley if desired. Sprinkle the topping mixture over the squash in your baking dish, then transfer to the center of the middle rack in your preheated oven.
  6. Bake for 30-35 minutes or until the cheese is melted and starting to bubble and the topping is lightly golden brown in color. You can also broil on low for the last few minutes to finish browning the panko topping.
  7. Remove from the oven and serve immediately.
Calories per Serving 257
Total Fat 12.9 g
Saturated Fat 7.1 g
Trans Fat 0.3 g
Cholesterol 78.4 mg
Total Carbohydrates 30.4 g
Dietary Fiber 3.9 g
Total Sugars 0.8 g
Sodium 292.1 mg
Protein 8.4 g
The information shown is Edamam’s estimate based on available ingredients and preparation. It should not be considered a substitute for a professional nutritionist’s advice.
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