I swear this Southern squash casserole is the one dish that makes every potluck plate look incomplete without it. With a creamy center, buttery cracker topping, and old-school charm, I can never count on leftovers.
I’m obsessed with Southern squash casserole because it takes humble yellow squash and turns it into the kind of side I keep “taste testing” until half the pan is gone. I love the way sharp cheddar cheese melts through every bite, rich and a little salty, while the top brings that crackly, buttery attitude I can never resist.
And yes, I will absolutely eat it next to fried chicken, barbecue, or straight from the dish with a fork. No shame.
But what really gets me is how old-school it tastes without feeling boring. Creamy, savory, golden.
First thing I want.
Ingredients
- Yellow squash keeps it tender, mild, and a little sweet.
Not boring, promise.
- Onion adds that cozy Southern casserole smell you’ll notice before the first bite.
- Eggs help everything set, so it slices instead of slumping everywhere.
- Sour cream brings tang and creaminess without making it feel too heavy.
- Mayonnaise adds richness.
Basically, it’s the quiet reason this tastes so good.
- Sharp cheddar gives the salty, melty bite everyone digs around for.
- Buttery crackers make the top crunchy, golden, and totally snacky.
- Melted butter helps the crumbs brown up and taste like comfort food.
- Flour thickens the filling so it’s creamy, not watery squash soup.
- Sugar balances the squash and onion, just enough to soften the edges.
- Salt wakes everything up.
Without it, this casserole gets real sleepy.
- Black pepper adds a little bite, nothing fancy, just needed.
- Garlic powder gives background flavor without bossing the whole dish around.
- Plus, the whole mix feels homey, cheesy, crunchy, and very potluck-ready.
Ingredient Quantities
- 4 cups yellow squash, sliced (about 4 medium)
- 1 small yellow onion, finely chopped (about 1 cup)
- 2 large eggs, beaten
- 1/2 cup sour cream
- 1/4 cup mayonnaise
- 1 cup sharp cheddar cheese, shredded
- 1 cup crushed buttery sandwich crackers (such as Ritz)
- 3 tablespoons unsalted butter, melted (reserve 1 tablespoon for topping)
- 1/4 cup all purpose flour
- 1 teaspoon granulated sugar
- 1 teaspoon kosher salt
- 1/2 teaspoon ground black pepper
- 1/4 teaspoon garlic powder
How to Make this
1. Preheat oven to 350°F and grease a 2 quart baking dish.
2. Slice squash and place in a colander, sprinkle with 1 teaspoon kosher salt, let sit 10 minutes, then squeeze out excess liquid using a clean kitchen towel or cheesecloth.
3. Finely chop the onion and sauté in 2 tablespoons butter over medium heat until soft and translucent, about 5 minutes; let cool slightly.
4. In a large bowl whisk eggs, sour cream, mayonnaise, 1 teaspoon granulated sugar, 1/2 teaspoon black pepper, and 1/4 teaspoon garlic powder until smooth.
5. Stir in the drained squash, cooled onion, 1 cup shredded cheddar, and 1/4 cup all purpose flour until evenly combined.
6. Transfer the mixture to the prepared baking dish and smooth the top.
7. Combine crushed buttery crackers with the remaining 1 tablespoon melted butter, tossing until crumbs are moistened.
8. Sprinkle the cracker topping evenly over the casserole and dot with any remaining butter if desired.
9. Bake for 30 to 40 minutes until casserole is bubbly and topping is golden brown.
10. Let rest 5 to 10 minutes before serving so it sets and slices cleanly.
Equipment Needed
1. Oven set to 350°F
2. 2 quart baking dish, greased
3. Colander
4. Clean kitchen towel or cheesecloth for squeezing squash
5. Skillet for sautéing onion
6. Large mixing bowl
7. Whisk and rubber spatula or wooden spoon
8. Measuring cups and spoons and a knife and cutting board
FAQ
Southern Squash Casserole Recipe Substitutions and Variations
- Yellow squash: use zucchini or a mix of zucchini and yellow squash for similar texture and mild flavor.
- Sour cream: swap with plain Greek yogurt for tang and creaminess with less fat.
- Sharp cheddar cheese: substitute Colby jack or Monterey Jack for milder, melty cheese; use smoked cheddar for a deeper flavor.
- Crushed buttery sandwich crackers: replace with panko mixed with 2 tablespoons melted butter for extra crunch, or use crushed buttery breadcrumbs or crushed saltine crackers.
Pro Tips
1. Salt and squeeze the squash early and thoroughly. Letting it sit longer than 10 minutes and wringing it well keeps the casserole from becoming watery and helps the flavors concentrate.
2. Cool the sautéed onions before mixing. Hot onions can scramble the eggs or thin the custard, so give them a few minutes to come down to room temperature.
3. Toast the cracker crumbs briefly in the oven or in a hot skillet before topping. That extra minute or two deepens the buttery flavor and helps the topping stay crisp instead of turning soggy.
4. Let it rest after baking. A 10 minute rest lets the filling set so you get clean slices and the texture holds together on the plate.
Southern Squash Casserole Recipe
I swear this Southern squash casserole is the one dish that makes every potluck plate look incomplete without it. With a creamy center, buttery cracker topping, and old-school charm, I can never count on leftovers.
6
servings
339
kcal
Equipment: 1. Oven set to 350°F
2. 2 quart baking dish, greased
3. Colander
4. Clean kitchen towel or cheesecloth for squeezing squash
5. Skillet for sautéing onion
6. Large mixing bowl
7. Whisk and rubber spatula or wooden spoon
8. Measuring cups and spoons and a knife and cutting board
Ingredients
4 cups yellow squash, sliced (about 4 medium)
1 small yellow onion, finely chopped (about 1 cup)
2 large eggs, beaten
1/2 cup sour cream
1/4 cup mayonnaise
1 cup sharp cheddar cheese, shredded
1 cup crushed buttery sandwich crackers (such as Ritz)
3 tablespoons unsalted butter, melted (reserve 1 tablespoon for topping)
1/4 cup all purpose flour
1 teaspoon granulated sugar
1 teaspoon kosher salt
1/2 teaspoon ground black pepper
1/4 teaspoon garlic powder
Directions
- Preheat oven to 350°F and grease a 2 quart baking dish.
- Slice squash and place in a colander, sprinkle with 1 teaspoon kosher salt, let sit 10 minutes, then squeeze out excess liquid using a clean kitchen towel or cheesecloth.
- Finely chop the onion and sauté in 2 tablespoons butter over medium heat until soft and translucent, about 5 minutes; let cool slightly.
- In a large bowl whisk eggs, sour cream, mayonnaise, 1 teaspoon granulated sugar, 1/2 teaspoon black pepper, and 1/4 teaspoon garlic powder until smooth.
- Stir in the drained squash, cooled onion, 1 cup shredded cheddar, and 1/4 cup all purpose flour until evenly combined.
- Transfer the mixture to the prepared baking dish and smooth the top.
- Combine crushed buttery crackers with the remaining 1 tablespoon melted butter, tossing until crumbs are moistened.
- Sprinkle the cracker topping evenly over the casserole and dot with any remaining butter if desired.
- Bake for 30 to 40 minutes until casserole is bubbly and topping is golden brown.
- Let rest 5 to 10 minutes before serving so it sets and slices cleanly.
Notes
- Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.
Nutrition Facts
- Serving Size: 190g
- Total number of serves: 6
- Calories: 339kcal
- Fat: 26.5g
- Saturated Fat: 8.6g
- Trans Fat: 0.5g
- Polyunsaturated: 3g
- Monounsaturated: 10g
- Cholesterol: 89mg
- Sodium: 400mg
- Potassium: 298mg
- Carbohydrates: 15.2g
- Fiber: 1.6g
- Sugar: 3g
- Protein: 9.2g
- Vitamin A: 400IU
- Vitamin C: 3.5mg
- Calcium: 150mg
- Iron: 0.5mg
