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southern squash casserole on a white plate

Southern Squash Casserole

  • Author: Melissa Riker
  • Prep Time: 10 minutes
  • Cook Time: 45 minutes
  • Total Time: 55 minutes
  • Yield: 12 1x
  • Category: side
  • Method: baking
  • Cuisine: American


Southern Squash Casserole is a classic summer dish perfect for using up all those squash from the garden. This classic casserole is a tasty side dish but is hearty enough to be the main course too!


Units Scale
  • 2-3 pounds yellow squash
  • 1/2 Vidalia onion, finely diced
  • 1 can cream of mushroom soup
  • 1 cup mayonnaise
  • 1 large egg
  • 8 ounces shredded sharp cheddar cheese
  • 1 teaspoon salt
  • 1/2 teaspoon ground pepper
  • 2 sleeves Ritz crackers
  • 1 stick butter, melted


  1. Preheat oven to 350 degrees Fahrenheit.
  2. Slice squash into 1/4 inch thick pieces and place in a large bowl.
  3. In a separate bowl, combine diced onion, soup, mayonnaise, egg, cheese, and salt and pepper. Mix to blend.
  4. Add mixture to squash and stir thoroughly to coat. Pour squash mixture into a 9 by 13 casserole dish.
  5. Crush Ritz crackers and place in a bowl.
  6. Pour melted butter over the crackers and stir to mix.
  7. Sprinkle crackers over the top of the squash to cover.
  8. Bake for 35 minutes, then cover with aluminum foil. Bake an additional 10 minutes.
  9. Serve warm.


  • Store in an airtight container in the refrigerator up to 3 days.

Keywords: Southern Squash Casserole