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Dive into creamy, cheesy comfort with this yellow squash casserole, a holiday side dish boasting a deliciously crunchy, buttery topping.

Yellow squash casserole being scooped with a serving spoon.

Cheesy Easy Squash Casserole

This decadent yellow squash casserole is the perfect addition to your side dish repertoire. Packed with thinly sliced yellow squash, a decadent cheese blend, and a satisfyingly crunchy Ritz cracker topping, it’s a guaranteed crowd-pleaser.

Similar to our Cheesy Zucchini Casserole, this recipe offers a crunchy twist and pairs beautifully with all your favorite holiday dishes โ€“ Roast Turkey, Best Mashed Potatoes, Dinner Rolls Recipe, and pies. Plus, it’s incredibly easy to make, leaving you more time to spend with loved ones during the festive season.

WHY WE LOVE IT:

  • Easy. This easy side dish is incredibly simple to make, requiring minimal prep work and just a few ingredients.
  • Summer freshness. This casserole is a great way to showcase the flavors of fresh summer squash when it’s in season. It’s a light and colorful dish that’s perfect for warmer-weather meals.
  • Budget-friendly. This comforting and satisfying casserole is a budget-friendly dish that utilizes affordable ingredients.
Shredded cheese in a white bowl.

Ingredients

  • 1 tablespoon vegetable oil – or olive oil
  • 4-5ย mediumย yellow summer squash,ย thinly sliced and halved – or butternut squash – we cut them to be about 1/4 inch thick.
  • 1 tablespoon unsalted butter
  • ยฝ cup Parmesan cheese, grated
  • 1ยฝ cups cheddar cheese, shredded, divided – Use mild or sharp cheddar cheese or replace some of the cheddar and combine it with mozzarella cheese, Monterey Jack, Gruyere, or even a smoked Gouda 
  • ยฝ cup sour cream or plain Greek yogurt
  • 1 teaspoon Italian seasoning
  • garlic salt (with parsley flakes)
  • black pepper
  • 2 tablespoons unsalted butter, melted
  • 1 sleeve Ritz Crackers, crushed medium to fine or another brand of buttery cracker, or crushed cornflakes

how to make Yellow squash casserole

  1. PREP. Preheat the oven to 350ยฐF
  2. SQUASH. Add the oil in a large skillet set to medium heat. Add the squash and butter. Cook until soft about 7-8 minutes
  3. ASSEMBLE. Pour the squash into a large bowl. Stir in the Parmesan cheese, 1 cup of cheddar cheese, sour cream, and Italian seasoning. Add garlic salt and pepper to taste.
    • Pour into a 9×13 greased baking dish. Sprinkle the remaining ยฝ cup of cheddar cheese on top. Set aside.
    • Add the crushed crackers into a gallon Ziploc bag and add the melted butter. Toss to coat the cracker crumbs. Spread evenly over the top of the casserole. 
  4. BAKE. Bake in the preheated oven for 20 minutes or until golden and bubbly.

PRO TIP: How to Prevent watery casserole

Slice the squash and sprinkle with ยฝ-1 teaspoon salt. Place it in a colander for 15-20 minutes then saute. Doing so before baking helps to remove excess moisture and prevents the casserole from becoming watery.

Squash casserole being dished out of baking pan.

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5 from 14 votes

Yellow Squash Casserole

By: Lil’ Luna
Dive into creamy, cheesy comfort with this yellow squash casserole, a holiday side dish boasting a deliciously crunchy, buttery topping.
Servings: 6
Prep: 15 minutes
Cook: 20 minutes
Total: 35 minutes

Ingredients 

  • 1 tablespoon vegetable oil
  • 4-5 medium yellow summer squash, thinly sliced and halved
  • 1 tablespoon butter
  • ยฝ cup Parmesan cheese, grated
  • 1ยฝ cups cheddar cheese, shredded, divided
  • ยฝ cup sour cream
  • 1 teaspoon Italian seasoning
  • garlic salt (with parsley flakes)
  • pepper
  • 2 tablespoons butter, melted
  • 1 sleeve Ritz Crackers, crushed medium to fine

Instructions 

  • Preheat the oven to 350ยฐF
  • Add the oil in a large skillet set to medium heat. Add the squash and butter. Cook until soft about 7-8 minutes
  • Pour the squash into a large bowl. Stir in the Parmesan cheese, 1 cup cheddar cheese, sour cream, and Italian seasoning. Add garlic salt and pepper to taste.
  • Pour into a 9×13 greased baking pan. Sprinkle the remaining ยฝ cup of cheddar cheese on top. Set aside.
  • Add the crushed crackers into a gallon Ziploc bag and add the melted butter. Toss to coat the crackers. Spread evenly over the top of the casserole.ย 
  • Bake for 20 minutes or until golden and bubbly.

Notes

Make Yellow Squash Casserole Ahead of Time?
  • Prepare the casserole according to the recipe up until the point of baking. Tightly cover the casserole dish with plastic wrap or with aluminum foil to prevent the casserole from drying out or absorbing any refrigerator odors.
  • When ready to bake, add the cracker crumb topping then bake according to the recipe instructions.
How to Store Squash Casserole?
  • Leftovers can be stored in an airtight container in the refrigerator and are best consumed within 3-4 days. It can also be frozen for up to 3 months.

Nutrition

Calories: 276kcal, Carbohydrates: 5g, Protein: 12g, Fat: 23g, Saturated Fat: 15g, Cholesterol: 60mg, Sodium: 379mg, Potassium: 404mg, Fiber: 1g, Sugar: 3g, Vitamin A: 905IU, Vitamin C: 22.4mg, Calcium: 348mg, Iron: 0.9mg

Nutrition information is automatically calculated, so should only be used as an approximation.

Recipe FAQ

  • For extra flavor and color, add other vegetables like chopped onions, bell peppers, or corn kernels to the squash mixture.
  • Prepare the casserole according to the recipe up until the point of baking. Tightly cover the casserole dish with plastic wrap or with aluminum foil to prevent the casserole from drying out or absorbing any refrigerator odors.
  • When ready to bake, add the cracker crumb topping then bake according to the recipe instructions.
  • Leftovers can be stored in an airtight container in the refrigerator and are best consumed within 3-4 days. It can also be frozen for up to 3 months.

About Kristyn

My name is Kristyn and Iโ€™m the mom of SIX stinkinโ€™ cute kids and the wife to my smokinโ€™ hot hubby, Lo. My momโ€™s maiden name is Luna, and Iโ€™m one of the many crafty โ€œLilโ€™ Lunasโ€ in the fam. On this site I like to share all things creative - from recipes to home decor to gifts and home decor ideas. Welcome!

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5 from 14 votes (4 ratings without comment)

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12 Comments

  1. emily says:

    can you use can squash

  2. Olivia says:

    5 stars
    A great side dish of squash with a crunchy topping. It really makes it extra good!