This delightful summer squash casserole is a perfect dish for warm weather gatherings. Combining tender summer squash and onion with creamy sour cream and melted cheddar cheese, it's topped with a crunchy cracker crust for a satisfying texture. It's a simple yet flavorful way to enjoy the bounty of summer produce.
If you don't usually keep summer squash in your pantry, you'll need to pick some up at the supermarket. Look for fresh, firm squash with a bright color. Sour cream and cheddar cheese are common dairy items, but if you don't have them on hand, make sure to grab them as well. Crackers for the topping can be any variety you prefer, but make sure they are plain or lightly salted.

Ingredients For Summer Squash Casserole Recipe
Summer squash: A tender and mild-flavored vegetable that forms the base of the casserole.
Onion: Adds a savory depth of flavor to the dish.
Cheddar cheese: Provides a rich and creamy texture with a sharp taste.
Sour cream: Adds creaminess and a slight tang to the casserole.
Crackers: Crushed and used as a crunchy topping.
Butter: Melted and drizzled over the cracker topping for added richness.
Salt: Enhances the flavors of the ingredients.
Pepper: Adds a hint of spice and balances the flavors.
Technique Tip for This Recipe
When boiling the summer squash and onion, make sure to not overcook them. They should be just tender enough to pierce with a fork but still hold their shape. Overcooking can lead to a mushy texture in the final casserole.
Suggested Side Dishes
Alternative Ingredients
summer squash - Substitute with zucchini: Zucchini has a similar texture and flavor profile, making it an excellent substitute for summer squash in casseroles.
chopped onion - Substitute with shallots: Shallots offer a milder and slightly sweeter flavor, which can add a different but pleasant taste to the casserole.
shredded cheddar cheese - Substitute with Monterey Jack cheese: Monterey Jack melts well and has a mild flavor that complements the other ingredients in the casserole.
sour cream - Substitute with Greek yogurt: Greek yogurt provides a similar creamy texture and tangy flavor while being lower in fat and higher in protein.
crushed crackers - Substitute with panko breadcrumbs: Panko breadcrumbs offer a light and crispy texture that works well as a topping for casseroles.
melted butter - Substitute with olive oil: Olive oil can provide a similar richness and moisture to the casserole while adding a slightly different flavor profile.
salt - Substitute with soy sauce: Soy sauce can add a depth of umami flavor and saltiness, enhancing the overall taste of the casserole.
pepper - Substitute with cayenne pepper: Cayenne pepper can add a bit of heat and spice, giving the casserole an extra kick.
Other Alternative Recipes Similar to This Casserole
How to Store or Freeze This Casserole
Allow the summer squash casserole to cool completely at room temperature before storing. This helps prevent condensation, which can make the dish soggy.
Transfer the cooled casserole to an airtight container. If you prefer, you can also cover the baking dish tightly with plastic wrap or aluminum foil.
Store the casserole in the refrigerator for up to 3-4 days. This ensures that the cheddar cheese and sour cream maintain their texture and flavor.
For longer storage, consider freezing the casserole. First, wrap the entire dish in plastic wrap, ensuring it is tightly sealed. Then, cover it with a layer of aluminum foil to prevent freezer burn.
Label the container with the date of preparation. This helps you keep track of how long the casserole has been stored.
When ready to enjoy, thaw the frozen casserole in the refrigerator overnight. This gradual thawing process helps maintain the integrity of the summer squash and crushed crackers topping.
Reheat the thawed casserole in a preheated oven at 350°F (175°C) for about 20-25 minutes, or until heated through. If the top starts to brown too quickly, cover it loosely with aluminum foil.
For a quicker reheating option, you can also microwave individual portions. Place a serving on a microwave-safe plate, cover with a microwave-safe lid or another plate, and heat on medium power for 2-3 minutes, checking and stirring halfway through.
To maintain the casserole's crispy topping, consider adding a fresh layer of crushed crackers and a drizzle of melted butter before reheating in the oven. This will revive the delightful crunch that complements the creamy interior.
How to Reheat Leftovers
Preheat your oven to 350°F (175°C). Place the leftover summer squash casserole in an oven-safe dish. Cover it with aluminum foil to prevent it from drying out. Bake for about 20-25 minutes or until heated through.
For a quicker method, use a microwave. Place a portion of the casserole on a microwave-safe plate. Cover it with a microwave-safe lid or another plate to retain moisture. Heat on medium power for 2-3 minutes, checking halfway through to stir and ensure even heating.
If you prefer a crispy top, use a toaster oven. Preheat the toaster oven to 350°F (175°C). Place the casserole in an oven-safe dish and cover it with aluminum foil. Heat for 15-20 minutes, then remove the foil and let it cook for an additional 5 minutes to crisp up the crushed crackers topping.
For stovetop reheating, use a non-stick skillet. Add a small amount of butter or olive oil to the skillet and heat over medium-low. Add the casserole and cover with a lid. Stir occasionally and heat until warmed through, about 10-15 minutes.
Best Tools for This Recipe
Oven: Used to bake the casserole at a consistent temperature of 350°F (175°C).
Large pot: Needed to boil the sliced summer squash and chopped onion until they are tender.
Mixing bowl: Used to combine the boiled squash, onion, cheddar cheese, sour cream, salt, and pepper.
Baking dish: The vessel where the mixture is transferred and baked until golden brown.
Knife: Essential for slicing the summer squash and chopping the onion.
Cutting board: Provides a safe surface for slicing and chopping the vegetables.
Measuring cups: Used to measure out the ingredients like cheddar cheese, sour cream, and crushed crackers.
Wooden spoon: Useful for mixing the ingredients together in the mixing bowl.
Colander: Used to drain the boiled squash and onion after they are tender.
Cheese grater: Needed to shred the cheddar cheese if it is not pre-shredded.
Crushing tool: Used to crush the crackers for the topping.
Small bowl: Used to melt the butter before drizzling it over the casserole.
Oven mitts: Essential for safely handling the hot baking dish when removing it from the oven.
How to Save Time on Making This Casserole
Pre-cook the squash: Boil the summer squash and onion in advance and store them in the fridge until ready to use.
Use pre-shredded cheese: Save time by using pre-shredded cheddar cheese instead of shredding it yourself.
Crush crackers ahead: Crush the crackers and store them in an airtight container to save time during assembly.
Melt butter in microwave: Quickly melt the butter in the microwave instead of on the stove.
One-pot method: Use the same pot for boiling and mixing to reduce cleanup time.

Summer Squash Casserole
Ingredients
Main Ingredients
- 4 cups sliced summer squash
- 1 cup chopped onion
- 1 cup shredded cheddar cheese
- 1 cup sour cream
- 1 cup crushed crackers
- 2 tablespoon butter melted
- to taste salt and pepper
Instructions
- Preheat oven to 350°F (175°C).
- In a large pot, boil sliced summer squash and chopped onion until tender. Drain well.
- In a mixing bowl, combine squash, onion, cheddar cheese, sour cream, salt, and pepper.
- Transfer mixture to a baking dish. Top with crushed crackers and drizzle with melted butter.
- Bake in preheated oven for 25 minutes, or until the top is golden brown.
Nutritional Value
Keywords
Suggested Appetizers and Desserts for This Casserole
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