Southern Squash Casserole is a creamy, cheesy side dish featuring tender yellow squash, sautéed onion, and a buttery crushed cracker topping. A true Southern classic, it works beautifully for holiday tables, summer dinners, and easy weeknight meals.
Why You’ll Love This Recipe
This Southern squash casserole balances creamy dairy, sharp cheddar, and a crisp, buttery cracker topping for a comforting, crowd-pleasing side. It highlights fresh summer squash but adapts well to zucchini or a mix of both. The recipe is simple to prepare with common pantry ingredients, reheats well, and freezes nicely for make-ahead meals.
- Comforting, cheesy Southern flavors
- Uses fresh summer squash or zucchini
- Easy to assemble from pantry staples
- Freezer-friendly and great for meal prep
Ingredients You’ll Need
Full ingredient amounts and measurements are listed in the recipe section below.
- Yellow squash – sliced about 1/4 inch thick; zucchini or a mix can be used.
- Yellow onion – chopped and sautéed until translucent.
- Garlic – minced for fresh flavor; garlic powder can substitute.
- Sour cream – for creaminess and tang; plain Greek yogurt works too.
- Mayonnaise – adds richness; can be partially replaced with additional sour cream or yogurt.
- Heavy cream – a little boosts richness; whole milk or half-and-half can be used instead.
- Sharp cheddar cheese – freshly grated for best melt; Colby or Monterey Jack are good alternatives.
- Eggs – beaten, to help the casserole set.
- Seasonings – onion powder, garlic powder, smoked paprika, cayenne (optional), salt and black pepper.
- Ritz crackers and butter – crushed crackers mixed with melted butter form the crunchy topping; breadcrumbs or crushed cornflakes also work.
How to Make It
Step 1: Preheat the oven to 375°F (190°C). Grease a 9-inch square or similar baking dish. In a large skillet, melt half the butter over medium-high heat. Add the sliced squash and chopped onion, season with salt and pepper, and sauté 5–7 minutes until tender but not mushy. Stir in the minced garlic and cook 30–60 seconds more, then remove from heat.
Step 2: In a large bowl, whisk together sour cream, mayonnaise, heavy cream, grated cheddar, and the dry seasonings. Add the cooked squash and onion mixture and stir until evenly combined. Taste and adjust salt and pepper as needed.
Step 3: Stir the beaten eggs into the mixture to bind everything together, then transfer to the prepared baking dish and spread into an even layer.
Step 4: Melt the remaining butter and toss with the crushed crackers. Spread the cracker mixture evenly over the casserole. Bake 40–45 minutes, until the top is golden and the filling is bubbling at the edges. Let the casserole rest a few minutes before slicing and serving.
Tips for Success
- Avoid overcooking the squash in the skillet. It should be tender but still maintain some texture so the casserole doesn’t turn watery.
- Freshly grate the cheese for the best melt and smooth texture.
- Season and taste the filling before adding the eggs so you can adjust salt and pepper.
- Allow the casserole to rest 5–10 minutes after baking to firm up for cleaner slices.
FAQs
Can I make this ahead? Yes. Assemble the casserole and refrigerate it, covered, for up to 24 hours. Bake just before serving.
Can I freeze it? Yes. You can freeze the baked casserole or assemble it unbaked and freeze for up to three months. Thaw overnight in the refrigerator before reheating or baking.
Why does my casserole become watery? Squash contains a lot of moisture. Cook it over medium-high heat long enough to evaporate excess water, and pat with paper towels if needed before combining with the other ingredients.
Is zucchini an acceptable substitute? Absolutely. Zucchini or a mix of zucchini and yellow squash work well in the same proportions.
Serving Suggestions
Serve this squash casserole alongside fried fish, oven-baked barbecue chicken, salmon croquettes, ham, or roast turkey. It pairs well with simple green salads, roasted vegetables, or warm cornbread for a complete Southern-inspired meal.
“Those who are wise will shine like the brightness of the heavens, and those who lead many to righteousness, like the stars for ever and ever.”
Daniel 12:3
If you tried this Southern Squash Casserole, leave a comment and rating below to share how it turned out.
📖 Recipe
Southern Squash Casserole
Author: Ashley Boyd
Summary: A creamy, cheesy casserole of yellow squash and onion with a crunchy buttery cracker topping. Simple, comforting, and perfect for family meals or holiday sides.
Prep Time: 10 mins | Cook Time: 45 mins | Total Time: 55 mins
Servings: 6 | Calories: 310 kcal (per serving)
Ingredients
- 4 tablespoons unsalted butter, divided
- 6 cups yellow squash, sliced 1/4-inch thick
- 1 small yellow onion, chopped
- Salt and cracked black pepper, to taste
- 3 cloves garlic, minced
- 3/4 cup sour cream
- 1/2 cup mayonnaise
- 1/4 cup heavy cream
- 2 large eggs, beaten
- 1 teaspoon onion powder
- 1 teaspoon garlic powder
- 1/2 teaspoon smoked paprika
- 1/4 teaspoon cayenne pepper (optional)
- 1 sleeve Ritz crackers, coarsely crushed
- 1 cup sharp cheddar cheese, freshly grated
Instructions
- Preheat the oven to 375°F (190°C). Grease a 9-inch square baking dish.
- Melt 2 tablespoons butter in a large nonstick skillet over medium-high heat. Add the squash and onion, season with salt and pepper, and cook 5–7 minutes until tender. Stir in the garlic and cook 30–60 seconds. Remove from heat.
- In a large bowl, combine sour cream, mayonnaise, heavy cream, grated cheddar, onion powder, garlic powder, smoked paprika, cayenne (if using), salt, and black pepper. Add the cooked squash mixture and stir to combine.
- Taste and adjust seasoning if needed. Stir in the beaten eggs until the mixture is uniform. Transfer to the prepared baking dish.
- Melt the remaining 2 tablespoons butter and mix with the crushed crackers. Sprinkle evenly over the casserole.
- Bake 40–45 minutes until the top is golden and the filling is bubbly. Allow to cool slightly before serving.
Notes & Storage
- Do not overcook the squash in the skillet; it should retain some texture.
- Freshly grated cheese melts better than pre-shredded blends with anti-caking agents.
- Refrigerator: Store cooled leftovers in an airtight container up to 4 days.
- Freezer: Wrap tightly and freeze up to 3 months. Thaw overnight in the refrigerator before reheating.
- Reheating: Warm in a 350°F oven until heated through, or microwave individual portions for 1–2 minutes.
Nutrition (approx.)
Per serving: Calories 310 kcal | Carbohydrates 14 g | Protein 7 g | Fat 25 g | Saturated Fat 11 g | Cholesterol 80 mg | Sodium 470 mg | Fiber 2 g | Sugar 4 g