This easy squash and zucchini casserole is a comforting dinner made with tender yellow squash, zucchini, onion, condensed cream of chicken soup, sour cream, and herb-seasoned stuffing mix. The vegetables are briefly parboiled, layered with buttery stuffing, and baked uncovered at 350°F for 30 to 40 minutes until bubbling and golden.
Each serving is creamy, savory, and pleasantly rich, with soft summer vegetables underneath a crisp, buttery topping. Optional shredded cheddar adds extra cheesiness, while the stuffing mix brings herbs and texture without requiring a separate bread crumb mixture.
Jump to RecipeWhy You’ll Love This Recipe
This casserole is the kind of dinner-table dish that turns a generous supply of summer squash and zucchini into something warm, creamy, and satisfying. It has the cozy character of a classic Southern vegetable bake, yet the preparation is simple enough for a busy weeknight.
The condensed soup and sour cream create a savory sauce that clings to every slice of squash and zucchini. The stuffing mix does double duty as a buttery bottom layer and a crisp, herb-filled topping, so every bite has a contrast between tender vegetables and golden crunch.
This recipe yields 6 to 8 servings, making it useful for a family dinner, a holiday side dish, or a relaxed gathering. For another savory appetizer to serve before dinner, you can also try our creamy cheeseburger dip.
Ingredients You’ll Need
The ingredient list is short, familiar, and easy to find. Choose firm, medium-sized squash and zucchini so the slices cook evenly and hold their shape in the casserole.
- Yellow squash and zucchini: Two medium yellow squash and two medium zucchini provide the colorful vegetable base. Slice them into approximately 1/4-inch rounds.
- Yellow onion: One small onion adds savory flavor and soft sweetness. It may be thinly sliced or finely chopped.
- Creamy sauce: A 10.5-ounce can of condensed cream of chicken soup is used undiluted, along with 1 cup of sour cream.
- Seasoning: Use 1/4 teaspoon black pepper and salt as needed. The stuffing mix and soup already contain seasoning, so a light hand with additional salt is best.
- Stuffing mix and butter: One 6-ounce package of herb-seasoned stuffing mix is divided between the base and topping. A 1/2 cup, or 1 stick, of melted unsalted butter moistens and browns the crumbs.
- Optional cheddar: Add 1/2 cup shredded cheddar if you want a more distinctly cheesy casserole.
Grease a 9-by-13-inch baking dish before you begin. Having the dish ready makes it easy to assemble the layers while the vegetables are still warm.
How to Make It Step-by-Step
Step 1: Heat the oven to 350°F (175°C), then grease a 9-by-13-inch baking dish. Use enough butter or cooking spray to lightly coat the bottom and sides, which helps the casserole release neatly when served.
Step 2: Bring a pot of salted water to a boil and add the sliced yellow squash, zucchini, and onion. Cook the vegetables for about 5 minutes, just until slightly tender; they should still have enough structure to finish cooking in the oven.
Step 3: Drain the vegetables exceptionally well. Let them sit in the colander for a few minutes, and gently shake the colander if needed, because excess water can thin the creamy sauce and make the finished casserole soupy.
Step 4: In a mixing bowl, stir together the undiluted condensed cream of chicken soup, sour cream, 1/4 teaspoon black pepper, and a small amount of salt. Mix until the sauce is smooth and evenly seasoned.
Step 5: Toss about half of the herb-seasoned stuffing mix with half of the melted butter. Spread this buttery mixture over the bottom of the prepared baking dish, pressing it into an even layer without packing it too firmly.
Step 6: Fold the thoroughly drained squash, zucchini, and onion into the soup-and-sour-cream mixture. If you are using cheddar, add the 1/2 cup shredded cheese now and fold gently so the vegetables do not break apart.
Step 7: Spoon the creamy vegetable mixture over the stuffing base. Smooth the surface with the back of a spoon so the filling reaches the corners and the casserole bakes at an even rate.
Step 8: Combine the remaining stuffing mix with the remaining melted butter. Scatter it evenly over the vegetable filling, creating a generous topping that will become crisp and golden in the oven.
Step 9: Bake the casserole uncovered for 30 to 40 minutes. It is ready when the edges are bubbling and the top is golden brown, with no need to cover it during baking.
Step 10: Remove the dish from the oven and let it rest for 5 to 10 minutes before serving. This brief pause allows the creamy filling to settle, making it easier to spoon out generous portions without losing the layers.
Chef’s Tips for a Perfect Casserole
The most important detail is removing as much water as possible from the vegetables. Summer squash naturally releases a lot of moisture, and even a carefully measured sauce can become thin if the cooked vegetables go straight from the pot into the mixing bowl.
Keep the parboiling time close to 5 minutes. The slices should be barely tender rather than soft or falling apart, since the 350°F oven continues cooking them for another 30 to 40 minutes.
For attractive slices, use a sharp knife and aim for rounds approximately 1/4 inch thick. Uniform pieces cook at the same pace and give the finished casserole a pleasing texture from edge to edge.
Use the cheddar as an optional addition rather than a requirement. The soup, sour cream, butter, and seasoned stuffing already create a rich dish, while cheddar brings a more pronounced cheese flavor for those who prefer it.
Do not cover the casserole while it bakes. An uncovered dish allows the buttered stuffing topping to brown and crisp, while the creamy filling bubbles gently underneath.
Looking for another vegetable-centered side for your dinner menu? These easy roasted potatoes pair nicely with the casserole when you want a hearty spread.
What to Serve with Squash and Zucchini Casserole
This casserole can serve as a substantial vegetable side alongside roasted chicken, baked pork, grilled steak, or a simple fish dinner. Its creamy texture is especially good with an uncomplicated main course that lets the stuffing topping and summer vegetables stand out.
For a lighter plate, serve it with a crisp green salad dressed with a tangy vinaigrette. The fresh greens and acidity balance the richness of the sour cream, butter, soup, and optional cheddar.
A basket of warm bread also fits naturally here, particularly when there is extra creamy sauce around the edges of the baking dish. If you are planning a full comfort-food menu, save a sweet finish such as our homestyle peach bread.
Storage and Reheating
Allow leftovers to cool, then transfer them to an airtight container or cover the baking dish well and refrigerate. The casserole is best enjoyed within a few days, while the vegetables and creamy sauce still have their freshest texture.
Reheat individual portions gently until warmed through. The stuffing topping may soften after refrigeration, but a brief warm-up in the oven can help restore some of its toasted texture.
If you are serving the casserole for a gathering, make sure it has rested for 5 to 10 minutes after baking before transferring it to the table. That rest makes the filling less loose and helps each scoop hold together.
Variations and Seasonal Ideas
The core recipe is intentionally classic, but small serving changes can make it fit different menus. Add the optional cheddar for extra richness, or leave it out when you want the herb-seasoned stuffing flavor to remain the focus.
For a colorful summer plate, garnish each serving with a little freshly cracked black pepper. You can also place a few thin raw squash or zucchini rounds around the serving platter for a simple seasonal presentation.
When planning a squash-themed dinner, our butternut squash fries offer a different texture and a fun roasted side. They are especially appealing when you want both a creamy casserole and a crisp vegetable option on the table.
Although some modern versions skip boiling and bake raw sliced vegetables for approximately 45 minutes, this traditional stuffing-topped preparation par-cooks the vegetables first. That method gives the squash and zucchini a tender texture while helping the casserole finish within its stated 30-to-40-minute baking time.
Easy Squash and Zucchini Casserole
Ingredients
Method
- Heat the oven to 350°F (175°C) and grease a 9-by-13-inch baking dish.
- Bring a pot of salted water to a boil. Add the sliced yellow squash, zucchini, and onion, then cook for about 5 minutes, just until slightly tender. Drain the vegetables exceptionally well.
- In a bowl, stir together the undiluted condensed cream of chicken soup, sour cream, black pepper, and a small amount of salt.
- Toss about half of the stuffing mix with half of the melted butter. Spread this mixture across the bottom of the prepared baking dish.
- Fold the well-drained vegetables into the soup-and-sour-cream mixture. Stir in the optional shredded cheddar if using.
- Spoon the vegetable mixture over the stuffing layer and spread it into an even layer.
- Combine the remaining stuffing mix with the remaining melted butter, then scatter it evenly over the top of the casserole.
- Bake the casserole uncovered for 30 to 40 minutes, until bubbling around the edges and golden brown on top. Let it rest for 5 to 10 minutes before serving.
Notes
Final Thoughts
This easy squash and zucchini casserole is a dependable dinner recipe for turning everyday summer vegetables into a creamy, bubbling, golden-brown bake. The brief parboil, careful draining, and two layers of buttery stuffing are the small details that make the finished dish richly flavored rather than watery.
Prepare it when you need 6 to 8 servings of comforting food without a long ingredient list or complicated technique. After a 5-to-10-minute rest, spoon it onto plates beside your favorite main course and enjoy tender vegetables, savory creaminess, and crisp herb-seasoned topping in every bite.
For a sweet Southern-inspired bite after dinner, you might also share our easy beignets with coffee or tea.
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