Recipe For Squash Casserole With Cream Of Mushroom Soup: Baked Layers Of Garden Freshness

This casserole brings together summer’s bounty with a creamy, comforting twist. The layers of fresh squash and rich sauce create a dish that feels both nostalgic and special.

I developed this version after testing countless combinations to find the perfect balance of textures and flavors. The cream of mushroom soup adds depth without overpowering the natural sweetness of the squash.

What emerges from the oven is a golden, bubbling casserole with tender squash and a creamy, savory sauce that everyone asks for seconds.

Perfect for Sunday suppers or potluck gatherings. Here’s how to make this garden-fresh classic.

Ingredients for Recipe for Squash Casserole with Cream of Mushroom Soup

Fresh squash, creamy soup, and a crispy topping make this casserole unforgettable.

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The squash is the star here. Look for firm, vibrant yellow squash and zucchini at your local farmers market or Whole Foods produce section. Avoid the giant ones—they get watery and seedy. For the cream of mushroom soup, Campbell’s is the classic choice, but Progresso works too. The cheddar should be sharp and freshly shredded (pre-shredded has anti-caking agents that melt weird).

No cream of mushroom soup? Cream of celery or chicken (wait, skip that—this is veg) cream of celery works in a pinch. Swap cheddar for Monterey Jack or pepper jack for a twist. For a gluten-free topping, use gluten-free crackers or panko. The sour cream can be Greek yogurt if you prefer, but full-fat gives the best texture.

Assemble the casserole the night before and refrigerate—just add the topping right before baking. Leftovers keep 4-5 days in the fridge and reheat beautifully. Honestly, it tastes even better the next day (the flavors meld). Freezes for 3 months if you want to stock up.

Step-by-Step Instructions for Squash Casserole with Cream of Mushroom Soup

Here’s the method that turns garden-fresh squash into a creamy, comforting bake.

Step 1: Prepare the Vegetables and Aromatics

Thinly slice all 3 lb Yellow Squash and 2 lb Zucchini into ¼-inch rounds. I use a mandoline for perfectly even slices, but a sharp knife works fine too. Finely dice the 1 whole Yellow Onion and mince the 3 cloves Garlic Cloves—these will build the flavor base.

Place the sliced squash in a colander and sprinkle with the 1 tsp Salt. Let it sit for 15 minutes to draw out excess moisture, then gently squeeze out the liquid. This prevents a watery casserole and ensures every bite is rich and creamy.

Step 2: Create the Creamy Sauce Base

In a large bowl, whisk together the 2 cans Cream of Mushroom Soup, 1 cup Sour Cream, 2 whole Large Eggs, minced garlic, 1 tsp Dried Thyme, and 0.5 tsp Black Pepper until smooth. The soup provides a velvety texture, while the sour cream adds tang and depth.

Fold in the drained squash and zucchini along with the diced onion. Stir until everything is evenly coated in the sauce. I like to let this mixture sit for 5 minutes to allow the flavors to meld before baking.

Step 3: Assemble the Casserole Layers

Preheat your oven to 350°F and grease a 9×13-inch baking dish with some of the 0.5 cup Butter. Spread half of the squash mixture evenly in the dish, then sprinkle 1 cup Sharp Cheddar Cheese evenly over the top. Repeat with the remaining squash mixture and the rest of the cheese.

This layering technique ensures every bite has a perfect balance of creamy squash and gooey cheese. The cheese melts into the sauce as it bakes, creating a decadent, unified dish.

Step 4: Add the Crunchy Topping and Bake

In a separate bowl, combine the 2 cups Ritz Crackers with the remaining melted butter and the grated 2 whole Carrots. The carrots add a subtle sweetness and extra texture to the topping. Sprinkle this mixture evenly over the casserole, pressing down lightly to adhere.

Bake for 45-50 minutes until the top is golden brown and the edges are bubbling. You’ll know it’s done when a knife inserted in the center comes out clean and the topping is crisp. Let it rest for 10 minutes before serving to allow the layers to set.

Dietary Considerations for recipe for squash casserole with cream of mushroom soup

Vegetarian Friendly

This dish is naturally vegetarian as written, with no meat or animal products beyond dairy and eggs. The cream of mushroom soup provides richness while keeping it meat-free. I’ve served this to vegetarian friends at gatherings, and it’s always a hit. 💪

Gluten Free Option

To make this gluten-free, simply swap the Ritz crackers for gluten-free crackers or panko. I’ve tested this with Schar brand gluten-free crackers from Central Market, and the texture is just as crispy. Always check your soup labels too—some brands contain wheat.

Dairy Free Adaptation

For a dairy-free version, use dairy-free cream of mushroom soup (like Impossible brand), vegan cheddar shreds, and coconut oil instead of butter. The topping can be made with dairy-free margarine and gluten-free crackers. David’s lactose-intolerant cousin loved this version.

Lower Fat Version

Cut the fat by using low-fat sour cream and reduced-fat cheese. You can also reduce the butter by half in the topping. I’ve made this lighter version for family potlucks, and honestly, most people don’t notice the difference. 💡

Vegan Modifications

For a fully vegan dish, use flax eggs (2 tbsp ground flax + 6 tbsp water), vegan cream of mushroom soup, and vegan cheese. The topping can be made with vegan butter and crackers. I tested this with Miyoko’s cheese and was pleasantly surprised by the melt.

Allergen Notes

This recipe contains dairy, eggs, and wheat (in crackers). For nut allergies, ensure all ingredients are processed in nut-free facilities. I always double-check labels at Austin farmers markets to be safe.

Frequently Asked Questions