Squash and Zucchini Casserole
This Squash and Zucchini Casserole combines tender zucchini, yellow squash, onions, creamy cheese, herbs, and a crispy buttery topping into one irresistible baked dish. Easy to prepare and full of fresh vegetable flavor, it's perfect as a holiday side dish, weeknight dinner accompaniment, or potluck favorite. Rich, creamy, and beautifully golden, this casserole is an excellent way to enjoy seasonal produce while creating a comforting family meal.
Ingredients
For the Casserole
- 3 medium zucchini, sliced
- 3 medium yellow squash, sliced
- 1 medium onion, finely chopped
- 2 cloves garlic, minced
- 2 tablespoons olive oil
- 1 cup shredded sharp cheddar cheese
- ½ cup grated Parmesan cheese
- ½ cup sour cream
- ½ cup mayonnaise
- 1 teaspoon Italian seasoning
- ½ teaspoon paprika
- Salt and black pepper, to taste
For the Topping
- 1 cup buttery crackers, crushed (or panko breadcrumbs)
- 2 tablespoons unsalted butter, melted
- 2 tablespoons grated Parmesan cheese
- 1 tablespoon chopped fresh parsley (optional)
Instructions
- Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish.
- Heat the olive oil in a large skillet over medium heat. Sauté the onion until softened, about 3–4 minutes.
- Add the garlic, zucchini, and yellow squash. Cook for 5–7 minutes until the vegetables are slightly tender. Drain any excess liquid.
- Transfer the vegetables to a large mixing bowl.
- Add the sour cream, mayonnaise, cheddar cheese, Parmesan cheese, Italian seasoning, paprika, salt, and pepper. Stir until well combined.
- Spread the mixture evenly into the prepared baking dish.
- In a small bowl, combine the crushed crackers, melted butter, and Parmesan cheese.
- Bake for 30–35 minutes, or until the casserole is bubbling and the topping is golden brown.
- Let the casserole rest for 5–10 minutes before serving. Garnish with fresh parsley if desired.
Notes
- Drain excess moisture from the vegetables to prevent a watery casserole.
- Freshly grated cheese melts better than pre-shredded cheese.
- Thin, evenly sliced squash ensures uniform cooking.
- Use full-fat sour cream for the creamiest texture.
- Crackers provide a buttery, crunchy topping, while panko offers a lighter crispness.
- Let the casserole rest before serving to help it set.
- Refrigerate leftovers in an airtight container.
- Reheat in the oven for the best texture