There’s something incredibly comforting about a dish that brings together the rich, caramelized flavors of French onion soup with the fresh, tender bite of golden yellow squash. This French Onion Squash Casserole Recipe is just that — a hearty, cheesy, and crunchy casserole that perfectly balances savory depth with vegetable goodness. If you’re craving a cozy, crowd-pleasing side or a wholesome centerpiece for your dinner plate, this recipe will quickly become a beloved staple in your kitchen rotation.
Ingredients You’ll Need
The beauty of this French Onion Squash Casserole Recipe lies in its simple yet thoughtfully chosen ingredients. Each one plays a key role in building layers of flavor, texture, and creaminess that come together in perfect harmony.
- 1 Tbsp olive oil: For sautéing the onions and squash to a tender, flavorful base.
- 3 lb yellow squash (sliced): Adds freshness, moisture, and a lovely mild flavor to the casserole.
- 1 onion (chopped): Provides that classic sweet and aromatic French onion flavor.
- 1 (10.5-oz) can Unsalted Cream of Mushroom Soup: Acts as a creamy binder, enriching the casserole’s texture.
- 1 cup refrigerated sour cream based French Onion Dip: Boosts the savory, tangy notes that make this dish irresistible.
- ½ tsp garlic powder: Adds subtle warmth without overpowering the delicate squash and onions.
- Salt and pepper (to taste): Essential seasonings to elevate the overall flavor balance.
- 1½ cups shredded cheddar cheese: Brings melty richness and a slight sharpness to every bite.
- 1 (6-oz) container French fried onions: Delivers crunchy topping magic with an authentic French onion twist.
How to Make French Onion Squash Casserole Recipe
Step 1: Prepare and Sauté the Vegetables
Start by heating olive oil in a large skillet over medium heat. Add the chopped onion and sliced yellow squash, cooking them gently until both are tender and just lightly caramelized. This step softens the vegetables and brings out their natural sweetness, building the base of flavors for the casserole. Once cooked, drain any excess liquid from the squash mixture in a colander to avoid a soggy casserole.
Step 2: Combine the Creamy Ingredients
In a large bowl, mix the sautéed squash and onions with cream of mushroom soup, sour cream based French onion dip, garlic powder, and half of the shredded cheddar cheese along with half of the French fried onions. Season the blend with salt and black pepper to your preference. This creamy, flavorful mixture is what makes the French Onion Squash Casserole Recipe so irresistibly rich and indulgent.
Step 3: Bake the Casserole
Lightly grease a 9×9-inch baking dish to prevent sticking, then spread the squash mixture evenly into the pan. Bake the casserole at 350ºF for 25 minutes, allowing it to bubble and the flavors to meld beautifully.
Step 4: Add Cheese and Crunchy Topping
After the initial baking time, remove the casserole from the oven and sprinkle the remaining cheddar cheese and French fried onions over the top. This creates a golden, crispy crust that perfectly contrasts the creamy filling. Pop the dish back into the oven for another 5 minutes to melt the cheese and crisp the topping to perfection.
How to Serve French Onion Squash Casserole Recipe
Garnishes
For a fresh burst of color and flavor, sprinkle some finely chopped fresh parsley or chives just before serving. The green not only brightens the presentation but also adds a mild herbal note that complements the savory richness of the casserole.
Side Dishes
This casserole pairs beautifully with roasted meats like chicken or beef, or alongside a crisp green salad for a lighter meal. Its creamy, cheesy texture and strong onion flavor make it an ideal side that holds its own on the dinner table.
Creative Ways to Present
Instead of serving family-style, consider portioning the casserole into individual ramekins for a charming personal touch at your next dinner party. You can also sprinkle extra fresh French fried onions on top just before serving to preserve their crunchiness.
Make Ahead and Storage
Storing Leftovers
Leftover French Onion Squash Casserole Recipe can be stored in an airtight container in the refrigerator for up to 3 days. The flavors only deepen overnight, making your next meal just as delightful.
Freezing
If you want to prep ahead, this casserole freezes well. Place the fully assembled (but not baked) casserole in a freezer-safe dish, cover tightly, and freeze for up to 2 months. Thaw in the refrigerator overnight before baking as directed.
Reheating
Reheat leftovers in the oven at 350ºF until warmed through, about 15-20 minutes. This will help maintain the crispy topping. Alternatively, a microwave works for quick reheating but may soften the crunchy onions.
FAQs
Can I use other types of squash for this recipe?
Absolutely! While yellow squash is traditional here, zucchini or a mix of summer squashes would also work beautifully in this French Onion Squash Casserole Recipe.
Is it possible to make this casserole dairy-free?
Yes, you can swap the sour cream based dip and cheddar cheese for dairy-free alternatives, and use a dairy-free cream of mushroom soup. The casserole will still be deliciously creamy and flavorful.
Can I add other vegetables to the casserole?
For sure! Diced bell peppers or mushrooms can be sautéed with the squash and onions to add more complexity and texture to this dish.
How spicy is the French Onion Squash Casserole Recipe?
This casserole is mild and savory with no spicy heat, making it perfect for all palates, including kids.
Will the French fried onions stay crunchy after baking?
The French fried onions on top will get delightfully crispy during the final baking stage, although some softness may occur underneath; adding a fresh sprinkle just before serving can keep them extra crunchy.
Final Thoughts
There’s such warmth in sharing a recipe that brings comfort food to a new level, and this French Onion Squash Casserole Recipe truly does that. It’s creamy, cheesy, and bursting with that signature French onion flavor, all while showcasing the humble squash in a way that’s exciting and satisfying. I can’t wait for you to try it and make it a cherished dish in your own home!
Print
French Onion Squash Casserole Recipe
- Prep Time: 10 minutes
- Cook Time: 25 minutes baking + 5 minutes final baking = 30 minutes
- Total Time: 40 minutes
- Yield: 6 servings
- Category: Casserole
- Method: Baking
- Cuisine: American
- Diet: Vegetarian
Description
A creamy and savory casserole combining tender yellow squash and onions with French onion dip, cream of mushroom soup, and cheddar cheese, topped with crispy French fried onions for a delightful texture and flavor contrast. Perfect as a comforting side dish or vegetarian main.
Ingredients
Main Ingredients
- 1 Tbsp olive oil
- 3 lb yellow squash, sliced
- 1 onion, chopped
- 1 (10.5-oz) can Unsalted Cream of Mushroom Soup
- 1 cup refrigerated sour cream based French Onion Dip
- ½ tsp garlic powder
- Salt and pepper to taste
- 1½ cups shredded cheddar cheese
- 1 (6-oz) container French fried onions
Instructions
- Preheat Oven: Preheat your oven to 350ºF (175ºC). Lightly spray a 9×9-inch baking dish with cooking spray to prevent sticking.
- Cook Vegetables: Heat olive oil in a large skillet over medium heat. Add the chopped onion and sliced yellow squash. Cook until the vegetables become tender, stirring occasionally. Drain any excess liquid from the vegetable mixture using a colander to avoid a watery casserole.
- Mix Ingredients: In a large bowl, combine the cooked squash and onion mixture with the cream of mushroom soup, French onion dip, garlic powder, 1 cup of shredded cheddar cheese, and half of the French fried onions. Season well with salt and black pepper to taste. Stir until well blended.
- Assemble Casserole: Spread the squash mixture evenly into the prepared baking dish, ensuring a smooth surface for baking.
- Bake: Bake the casserole in the preheated oven for 25 minutes until heated through and beginning to set.
- Add Topping and Finish Baking: Remove the casserole from the oven, then sprinkle the remaining ½ cup of shredded cheddar cheese and the rest of the French fried onions on top. Return to the oven and bake for an additional 5 minutes, allowing the topping to melt and become crisp.
Notes
- To reduce moisture in the casserole, be sure to drain excess liquid from the cooked squash and onions.
- For a crispier topping, broil the casserole for 1-2 minutes after the final bake, watching carefully to avoid burning.
- This casserole can be prepared a day ahead and refrigerated; add crispy onions just before serving to maintain texture.
- Use low-fat or reduced-fat sour cream and cheese to lighten the dish if desired.
- Feel free to substitute yellow squash with zucchini for a different flavor profile.
