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Grandma's Yellow Squash Recipe: The Best Southern Cheesy Casserole

Grandma's Yellow Squash Recipe

A creamy Southern yellow squash casserole made with onion, mayonnaise, egg, Cheddar cheese, and a buttery cracker crumb topping. It is an easy, comforting side dish for family dinners and holiday tables.
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Prep Time 15 minutes
Cook Time 40 minutes
Total Time 55 minutes
Servings: 4 servings
Ingredients Method Notes

Ingredients
  

Main Ingredients
  • 2 pounds Yellow squash, sliced about 1/4 inch thick
  • 1 Medium onion, chopped
  • 1 cup Mayonnaise
  • 1 Large egg, beaten
  • 1 cup Shredded Cheddar cheese
  • 1 teaspoon Salt, or to taste
  • 1/2 teaspoon Black pepper
Topping
  • 1 1/2 cups crumbs Buttery round crackers, crushed
  • 1/4 cup Butter, melted

Method
 

Step-by-Step
  1. Heat the oven to 350°F and lightly grease a 2-quart baking dish.
  2. Place the sliced yellow squash and chopped onion in a saucepan. Cover with water, bring to a boil, and simmer for 5 to 10 minutes, just until tender.
  3. Drain the squash and onion very well, gently pressing out excess moisture if needed.
  4. Combine the drained vegetables with the mayonnaise, beaten egg, shredded Cheddar, salt, and black pepper.
  5. Transfer the mixture to the prepared 2-quart baking dish.
  6. Mix the crushed buttery crackers with the melted butter, then spread the crumbs evenly over the casserole.
  7. Bake uncovered for about 30 minutes, until hot, bubbling, and lightly browned.

Notes

Drain the cooked squash thoroughly because excess water can make the casserole soupy. Cook the squash only until tender, since it continues cooking during the bake. Sharp Cheddar adds extra flavor. Refrigerate leftovers and reheat until hot.