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Yellow Squash Casserole Recipe

Published: May 21, 2025 by Jamie · This post may contain affiliate links · Leave a Comment

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Imagine a side dish that captures the essence of Southern home cooking, transforming humble yellow squash into a creamy, cheesy masterpiece. Welcome to the Yellow Squash Casserole, a beloved recipe that turns simple garden vegetables into an irresistible culinary experience.

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This extraordinary casserole brings together fresh yellow squash, rich cheeses, and a crispy cracker topping that will have everyone at the table asking for seconds. Moreover, it's the perfect way to use up an abundant summer squash harvest or simply enjoy a comforting side dish.

Perfect for family dinners, potlucks, or as a delightful accompaniment to any main course, this Yellow Squash Casserole promises to become a new favorite.

Yellow Squash Casserole: A Southern Culinary Treasure

This isn't just another vegetable dish – it's a celebration of Southern cooking that transforms simple ingredients into something extraordinary. Picture tender yellow squash nestled in a creamy, cheesy mixture, topped with a golden, buttery cracker crust.

Get ready to discover how fresh garden vegetables can become a show-stopping side dish that steals the spotlight.

Serving Suggestions:

Complement your Yellow Squash Casserole with:

  • Grilled chicken
  • Roasted meats
  • Fresh green salad
  • Cornbread
  • Iced sweet tea

Pro Tips for the Perfect Yellow Squash Casserole:

Squash Selection: Choose fresh, firm yellow squash for the best flavor and texture.

Moisture Management: Drain excess liquid after cooking squash to prevent a watery casserole.

Cheese Choice: Use high-quality sharp cheddar for maximum flavor.

Cracker Crunch: Mix breadcrumbs or crackers with melted butter for a perfectly crispy topping.

Make-Ahead Magic: Prepare the casserole in advance and refrigerate before baking.

Yellow Squash Casserole Recipe

Yellow Squash Casserole Recipe Details:

  • Preparation time: 20 minutes
  • Cooking time: 35 minutes
  • Servings: 6-8
  • Equipment: 9x9-inch baking dish, skillet, mixing bowls

This incredible side dish transforms simple yellow squash into a creamy, cheesy masterpiece that celebrates the best of Southern cooking.

Ingredients:

For the Squash Base:

  • 5 cups sliced yellow squash
  • 1 small onion, diced
  • 1 tablespoon butter
  • 2 large eggs
  • ½ cup sour cream
  • ½ cup mayonnaise
  • 1 cup shredded cheddar cheese
  • ½ teaspoon garlic powder
  • Salt and pepper, to taste

For the Crispy Topping:

  • 1 cup crushed buttery crackers or breadcrumbs
  • 2 tablespoons melted butter
  • Nonstick spray for greasing

Directions:

  1. Preheat your oven to 350°F. Generously spray a 9x9-inch baking dish with nonstick spray, ensuring complete coverage to prevent sticking.
  2. In a large skillet, melt 1 tablespoon of butter over medium heat. Add the sliced yellow squash and diced onion. Cook for approximately 10 minutes, stirring occasionally, until the vegetables are softened and slightly translucent.
  3. Carefully drain any excess liquid from the squash and onion mixture. This step is crucial to prevent a watery casserole.
  4. In a large mixing bowl, whisk the eggs until well beaten. Add sour cream, mayonnaise, shredded cheddar cheese, garlic powder, salt, and pepper. Stir until all ingredients are thoroughly combined.
  5. Gently fold the cooked squash and onions into the creamy mixture. Ensure the vegetables are evenly distributed throughout the mixture.
  6. Transfer the squash mixture to the prepared baking dish, spreading it evenly and smoothing the top with a spatula.
  7. In a separate small bowl, mix the crushed crackers or breadcrumbs with the melted butter. Sprinkle this buttery topping evenly over the squash mixture.
  8. Place the casserole in the preheated oven and bake uncovered for 30 to 35 minutes. Look for a golden-brown top and bubbling edges.
  9. Remove from the oven and let the casserole cool slightly for 5-10 minutes before serving. This allows the casserole to set and makes serving easier.

Ready to Indulge!

Serve your Yellow Squash Casserole hot, watching as everyone eagerly digs into the creamy, cheesy goodness. Each serving promises a perfect blend of tender squash and crispy topping.

Storage Solutions:

  • Refrigerate in an airtight container for up to 3 days
  • Reheat individual portions in the microwave
  • Can be frozen for up to 1 month
  • Thaw overnight in the refrigerator before reheating
  • Best enjoyed within 2 days of preparation

Whether you're looking to use up summer squash or simply craving a comforting side dish, this Yellow Squash Casserole delivers pure Southern comfort in every single bite.

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Yellow Squash Casserole Recipe

Yellow Squash Casserole Recipe

Print Recipe
Pin Recipe

This incredible side dish transforms simple yellow squash into a creamy, cheesy masterpiece that celebrates the best of Southern cooking.

  • Total Time: 55 minutes
  • Yield: 6-8 1x

Ingredients

Scale

For the Squash Base:

  • 5 cups sliced yellow squash
  • 1 small onion, diced
  • 1 tablespoon butter
  • 2 large eggs
  • ½ cup sour cream
  • ½ cup mayonnaise
  • 1 cup shredded cheddar cheese
  • ½ teaspoon garlic powder
  • Salt and pepper, to taste

For the Crispy Topping:

  • 1 cup crushed buttery crackers or breadcrumbs
  • 2 tablespoons melted butter
  • Nonstick spray for greasing

Instructions

  1. Preheat your oven to 350°F. Generously spray a 9x9-inch baking dish with nonstick spray, ensuring complete coverage to prevent sticking.
  2. In a large skillet, melt 1 tablespoon of butter over medium heat. Add the sliced yellow squash and diced onion. Cook for approximately 10 minutes, stirring occasionally, until the vegetables are softened and slightly translucent.
  3. Carefully drain any excess liquid from the squash and onion mixture. This step is crucial to prevent a watery casserole.
  4. In a large mixing bowl, whisk the eggs until well beaten. Add sour cream, mayonnaise, shredded cheddar cheese, garlic powder, salt, and pepper. Stir until all ingredients are thoroughly combined.
  5. Gently fold the cooked squash and onions into the creamy mixture. Ensure the vegetables are evenly distributed throughout the mixture.
  6. Transfer the squash mixture to the prepared baking dish, spreading it evenly and smoothing the top with a spatula.
  7. In a separate small bowl, mix the crushed crackers or breadcrumbs with the melted butter. Sprinkle this buttery topping evenly over the squash mixture.
  8. Place the casserole in the preheated oven and bake uncovered for 30 to 35 minutes. Look for a golden-brown top and bubbling edges.
  9. Remove from the oven and let the casserole cool slightly for 5-10 minutes before serving. This allows the casserole to set and makes serving easier.
  • Author: Jamie
  • Prep Time: 20 minutes
  • Cook Time: 35 minutes

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