Looking for an easy side dish that pairs beautifully with almost any meal? This Cheesy Roasted Yellow Squash Bake is packed with flavor, loaded with melted cheese, and finished with a crispy golden topping. Unlike traditional squash casseroles that can become watery, this version roasts the squash first to preserve its texture and natural sweetness. Whether you’re serving it alongside grilled meats, baked chicken, seafood, or a holiday dinner, this comforting casserole is guaranteed to earn a spot in your regular recipe rotation.

Ingredients

For the Casserole

• 4 medium yellow squash, cut into bite-sized cubes
• 4 slices thick-cut bacon, diced
• ¾ small onion, finely chopped
• ½ small orange bell pepper, diced (optional)
• 1½ cups shredded cheddar cheese, divided
• ¼ cup mayonnaise
• ¼ cup sour cream
• ½ teaspoon black pepper
• ½ teaspoon salt (or to taste)

For the Crunchy Topping

• ⅓ cup panko breadcrumbs
• 1 tablespoon melted butter

Additional

• Nonstick cooking spray

Instructions

Preheat your oven to 350°F (175°C).

Wash and dry the squash thoroughly. Trim off the ends and cut the squash into medium-sized cubes. Avoid cutting them too small, as they can become overly soft during cooking.

Heat a large skillet over medium-high heat. Add the diced bacon and cook until crisp and golden.

Add the chopped onion to the skillet and cook until softened and translucent, about 3 to 4 minutes.

Transfer the bacon and onion mixture to a plate lined with paper towels to drain excess grease.

Using the same skillet, add the cubed squash. Cook for several minutes, stirring occasionally, until lightly browned and slightly caramelized. The squash should remain firm and not become mushy.

Add the diced bell pepper and cook for another 2 minutes.

Remove the skillet from the heat.

In a large mixing bowl, combine the roasted squash, bell pepper, bacon, onion, 1 cup of the shredded cheddar cheese, mayonnaise, sour cream, black pepper, and salt.

Mix gently until everything is evenly coated.

Lightly spray a 9 x 11-inch baking dish with nonstick cooking spray.

Transfer the squash mixture to the baking dish and spread it into an even layer.

Sprinkle the remaining cheddar cheese evenly over the top.

In a small skillet over medium-low heat, combine the melted butter and panko breadcrumbs. Stir continuously until the breadcrumbs become lightly golden and fragrant.

Sprinkle the toasted breadcrumbs evenly over the casserole.

Bake for 25 to 30 minutes, or until the cheese is fully melted and bubbling around the edges.

Allow the casserole to rest for 5 minutes before serving.

Notes and Tips

• Roasting the squash instead of boiling helps maintain its texture and prevents a watery casserole.
• Sharp cheddar provides the boldest flavor, but Monterey Jack, Colby Jack, or a cheese blend also work well.
• For extra richness, add a few tablespoons of cream cheese to the mixture.
• If you prefer a vegetarian version, simply omit the bacon.
• The casserole can be assembled several hours ahead and baked just before serving.
• Leftovers store well in the refrigerator for up to 3 days and reheat beautifully.

Have you tried a squash casserole like this before? Give it a try and let us know what you paired it with. We’d love to hear your favorite variations and family twists on this comforting classic!