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Southern yellow squash casserole in a white baking dish.
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5 from 4 votes

Southern Yellow Squash Casserole

This Southern squash casserole is topped off with a buttery Ritz cracker topping, then baked to perfection. An easy and delicious side dish, that pairs wonderfully with any main dish.
Prep Time15 mins
Cook Time35 mins
Total Time50 mins
Course: Side
Cuisine: American
Servings: 8
Calories: 291kcal


  • 3 lbs yellow squash about 5 squash, sliced into 1-inch rounds
  • 4 tbsp butter
  • 1 onion finely diced
  • 2 garlic cloves finely minced
  • 1 tsp Italian seasoning
  • 1 tbsp sugar
  • 2 eggs
  • 1/2 cup mayo
  • 2 cups Gruyere cheese shredded
  • 1/2 cup sour cream
  • salt and pepper to taste


  • 1 cup ritz crackers crushed
  • 2 tbsp butter melted


  • Preheat oven to 350 degrees F. and grease an 8x8 baking dish with cooking spray or softened butter.
  • Slice the squash into 1-inch rounds.
  • Melt 4 tbsp of butter in a large skillet over medium-high heat. Add the squash and onions, cover, and cook for 10 minutes, stirring occasionally. Stir in the fresh garlic, Italian seasoning, sugar, and season with salt and pepper.
  • Place the squash mixture in a colander and let it sit for 5 minutes.
  • In a large bowl, mix the shredded Gruyere cheese, mayo, sour cream, and eggs until well combined.
  • Add the onion and squash mixture into the mayo mixture and mix well. Season with salt and pepper.
  • In a medium-sized bowl, mix the crushed ritz crackers and 2 tbsp melted butter until well combined.
  • Place the squash mixture into the prepared baking dish and top it off with the ritz cracker mixture. Bake for 25 minutes uncovered and enjoy!


  • Make sure to place the cooked squash and onion mixture in a colander and drain it well before mixing in the rest of the ingredients.
  • To make it low carb, omit the ritz crackers and granulated sugar.
  • I prefer the ritz crackers a bit chunky. Don't over-crush them!


Calories: 291kcal | Carbohydrates: 14g | Protein: 5g | Fat: 25g | Saturated Fat: 10g | Polyunsaturated Fat: 8g | Monounsaturated Fat: 6g | Trans Fat: 1g | Cholesterol: 77mg | Sodium: 261mg | Potassium: 522mg | Fiber: 2g | Sugar: 7g | Vitamin A: 765IU | Vitamin C: 30mg | Calcium: 71mg | Iron: 1mg