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a wooden spoon lifting a scoop of squash casserole from a baking dish.
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Squash Casserole Recipe

Squash casserole is one of my favorite vegetarian side dishes to make for the holidays. It's rich, creamy, cheesy, and so delicious!
Step-by-step photos can be seen below the recipe card.
Prep Time15 minutes
Cook Time30 minutes
Total Time45 minutes
Course: Side Dish
Cuisine: American
Servings: 8
Author: Laurel Perry

Equipment

  • 11x7-inch Baking Pan

Ingredients

  • 6 tablespoons unsalted butter divided (¾ stick), plus more for greasing the pan
  • 3 pounds yellow squash sliced ¼-inch thick
  • 1 medium sweet onion chopped
  • 2 teaspoons kosher salt divided
  • 2 large eggs beaten
  • 1 cup sour cream
  • ½ cup mayonnaise
  • 8 ounces freshly shredded sharp cheddar cheese divided
  • 1 tablespoon chopped fresh chives plus more for garnish
  • ½ teaspoon ground black pepper
  • 2 sleeves round buttery crackers coarsely crushed

Instructions

  • Preheat the oven to 350°F. Grease an 11x7-inch baking dish with butter.
  • Melt 2 tablespoons of butter in a large skillet over medium heat. Once melted, stir in the squash, onion, and 1 teaspoon salt. Cook, stirring occasionally, until softened, about 8-10 minutes.
    6 tablespoons unsalted butter, 3 pounds yellow squash, 1 medium sweet onion, 2 teaspoons kosher salt
    sliced yellow squash in a pan.
  • Transfer the squash mixture to a colander set over the sink and let drain for 5 minutes.
    draining cooked yellow squash in a colander.
  • In a large bowl, mix the eggs, sour cream, mayonnaise, half the cheddar cheese, chives, remaining 1 teaspoon salt, and pepper.
    2 large eggs, 1 cup sour cream, ½ cup mayonnaise, 8 ounces freshly shredded sharp cheddar cheese, 1 tablespoon chopped fresh chives, ½ teaspoon ground black pepper
  • Add the squash and gently fold to combine.
    cooked yellow squash mixed with sour cream, eggs, and mayo in a baking dish.
  • Pour the squash mixture into the prepared pan. Top with the remaining cheddar cheese.
    squash casserole topped with cheese in a baking dish.
  • In a medium bowl, melt the remaining 4 tablespoons butter. Stir in the crushed crackers. Sprinkle the crackers evenly over the top of the dish.
    2 sleeves round buttery crackers
    unbaked squash casserole in a baking dish.
  • Bake for 20 minutes or until the filling is warmed through and the topping is golden brown. Let cool for 5 minutes, top with extra chives, if using, and serve.
    overhead view of squash casserole in a baking dish.

Video

Nutrition

Serving: 1serving | Calories: 403kcal | Carbohydrates: 11g | Protein: 12g | Fat: 36g | Saturated Fat: 16g | Polyunsaturated Fat: 8g | Monounsaturated Fat: 8g | Trans Fat: 0.4g | Cholesterol: 120mg | Sodium: 892mg | Potassium: 578mg | Fiber: 2g | Sugar: 7g | Vitamin A: 1160IU | Vitamin C: 31mg | Calcium: 276mg | Iron: 1mg