Name: Butternut Squash Casserole with Sage, Cranberries, and Sourdough Breadcrumbs Recipe
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: American
Ingredients: 2 cups cubed butternut squash; 1 heaping cup chopped leeks, white and light green parts, rinsed well; 2 celery stalks, chopped; 3 garlic cloves, minced (or 5 cloves roasted garlic, minced); Heaping ¼ cup chopped fresh sage, plus about 12 small leaves; 2 teaspoons minced fresh rosemary; 8 tiny pearl onions, peeled and sliced in half; ¼ cup chopped fresh parsley; Heaping 5 cups cubed sourdough bread (1-inch cubes); ¼ cup dry white wine; 1½ cups vegetable broth, more if needed; 2 tablespoons extra-virgin olive oil, divided, plus more for drizzling and greasing; Sea salt and freshly ground black pepper, to taste; ¼ cup dried cranberries

Jump to Recipe· 4.2 from 75 reviews

If you’re craving a comforting yet vibrant side dish, this Butternut Squash Casserole with Sage, Cranberries, and Sourdough Breadcrumbs Recipe is the perfect answer. Bursting with autumnal flavors, it elevates classic bread stuffing by layering tender roasted butternut squash, aromatic sage, tart dried cranberries, and crunchy sourdough breadcrumbs for texture and depth. Whether you’re serving it at Thanksgiving or simply want a cozy dish to brighten chilly evenings, this casserole is a guaranteed crowd-pleaser that feels both familiar and wonderfully fresh.

The image shows an arrangement of raw ingredients on a white marbled surface. There is a round loaf of bread with a dusting of flour creating a pattern on top, placed near the bottom left. Above it, a light brown butternut squash lies on the surface, next to a bunch of fresh sage leaves. Two fresh leeks, light green at the bottom and dark green at the top, rest on a white cloth with blue stripes. To the right, a small white bowl holds chopped green celery, and nearby is a wooden spoon filled with dried dark red cranberries. A small round white bowl contains small red onions with their roots facing upwards. A whole garlic bulb with white skin sits near the butternut squash. The setting has a clean and fresh look, showing all ingredients clearly. Photo taken with an iphone --ar 4:5 --v 7

Ingredients You'll Need

You don’t need a pantry full of complicated ingredients for this recipe. Each component is carefully chosen to deliver a perfect balance of sweetness, earthiness, and savory aroma, creating a dish that’s as easy to make as it is delicious to enjoy.

Butternut squash: Roasting brings out its natural sweetness and soft texture.
Extra-virgin olive oil: Adds richness and helps soften vegetables while roasting and sautéing.
Leeks: Offer a mild onion flavor that gently harmonizes with the other ingredients.
Celery: Brings a subtle crunch and fresh note to the mix.
Dry white wine: Enhances layers of flavor with a touch of acidity and complexity.
Garlic: Lends a warm, fragrant foundation to the casserole.
Fresh sage and rosemary: Infuse earthy, piney herb notes essential to this recipe’s character.
Cubed sourdough bread: The crunchiest and most flavorful breadcrumb base you can ask for.
Vegetable broth: Moistens the bread and ties all the flavors together seamlessly.
Pearl onions: Offer a tender, sweet bite amid the rustic breadcrumbs.
Dried cranberries: Provide pops of tartness that brighten the entire dish.
Fresh parsley: Adds a final touch of fresh color and subtle herbaceous notes.
Sea salt and freshly ground black pepper: To season perfectly and awaken every ingredient’s flavor.

How to Make Butternut Squash Casserole with Sage, Cranberries, and Sourdough Breadcrumbs Recipe

Step 1: Roast the Butternut Squash

Start by preheating your oven to 400°F and lining a baking sheet with parchment paper for easy cleanup. Toss the cubed butternut squash with a drizzle of olive oil, plus generous pinches of salt and freshly ground black pepper. Roast these cubes for about 25 minutes until they’re tender and slightly caramelized, releasing a beautiful natural sweetness that forms the backbone of this dish.

Step 2: Sauté the Aromatics

Lower the oven temperature to 350°F and prepare your casserole dish by greasing it lightly with olive oil. In a large skillet, heat 1 tablespoon of olive oil over medium heat. Add the chopped leeks and celery along with salt and pepper. Cook until the vegetables become translucent and soft, which usually takes 5 to 7 minutes. Stir in the garlic, chopped sage, and rosemary, letting the herbs infuse the mixture. Pour in the white wine, quickly stir, and let it reduce for about 30 seconds to meld those complex flavors.

Step 3: Combine Bread and Broth

Next, add the hearty cubed sourdough bread to the skillet, followed by 1 cup of vegetable broth. Toss gently but thoroughly so each bread cube soaks up the flavorful mixture without turning mushy. This step ensures every bite has moisture and that satisfying contrast of soft and crisp textures.

Step 4: Assemble the Casserole

Transfer the bread mixture into your prepared baking dish. Drizzle the remaining ½ cup of vegetable broth over the top, especially targeting any dry-looking spots. Nestle the roasted butternut squash, pearl onions, and extra sage leaves evenly throughout the bread. Finish by drizzling 1 tablespoon more olive oil on top and seasoning with additional salt and pepper to taste. This adds another layer of flavor and helps the top crisp beautifully in the oven.

Step 5: Bake until Golden and Perfect

Bake the casserole for 20 to 25 minutes, or until the top turns a gorgeous golden brown. Right before serving, sprinkle the dish with dried cranberries and fresh parsley. The cranberries introduce bright, juicy bursts of tartness, while the parsley adds freshness and a vibrant pop of color that makes this dish just as delightful to look at as it is to eat.

How to Serve Butternut Squash Casserole with Sage, Cranberries, and Sourdough Breadcrumbs Recipe

A silver pan filled with two layers of chopped green vegetables, mainly light and dark green rings and small pieces spread evenly in the pan, with a wooden spoon resting inside the pan over the vegetables showing its smooth light brown texture. Above the pan to the right, there is a clear glass measuring cup full of white bread cubes with toasted brown crusts on top, stacked loosely. Below to the left of the pan, there is a small round wooden dish with dried dark red berries and a few fresh green sage leaves placed beside it on a white marbled surface. A folded white cloth with black tiny designs is placed near the measuring cup. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

Consider topping your casserole with a few crisp sage leaves fried lightly in butter for a beautiful, crunchy garnish that also enhances the herbaceous aroma. A sprinkle of chopped toasted pecans or walnuts can add an additional layer of nuttiness and texture if you want to mix things up.

Side Dishes

This casserole pairs wonderfully with roasted turkey or chicken, making it a fantastic holiday staple. It also complements vegetarian mains like mushroom Wellington or lentil loaf, balancing richer, earthier flavors with its subtle sweetness and fresh herbs.

Creative Ways to Present

For a charming presentation, serve the casserole in individual ramekins or mini cast iron skillets, allowing each guest to enjoy their personal portion with a perfectly browned crust. You could also layer this side dish in a trifle-style glass where the layers of bread, squash, and fruit peek through for a stunning visual effect.

Make Ahead and Storage

Storing Leftovers

Once cooled, cover any leftovers tightly with plastic wrap or transfer to an airtight container. Stored in the refrigerator, the casserole will stay fresh and delicious for up to 3 days, making it a convenient option for meals later in the week.

Freezing

This casserole freezes beautifully. Portion it into airtight containers or wrap a whole casserole dish securely with foil and plastic wrap. Freeze for up to 2 months. When you’re ready to enjoy it, thaw it overnight in the fridge before reheating.

Reheating

To reheat, place portions in a preheated 350°F oven for about 20 minutes or until warmed through and the top regains crispiness. If reheating from frozen, add an additional 10-15 minutes and cover loosely with foil to prevent over-browning while warming through evenly.

FAQs

Can I substitute the sourdough bread with another bread?

Absolutely! While sourdough adds wonderful flavor and texture, you can use other rustic breads like French or country white bread. Avoid soft sandwich breads as they can become too mushy after baking.

Is this recipe vegetarian?

Yes, this Butternut Squash Casserole with Sage, Cranberries, and Sourdough Breadcrumbs Recipe is vegetarian-friendly since it uses vegetable broth. Just be sure the broth you choose is free from animal products to keep it fully vegetarian.

Can I make this dish vegan?

To make it vegan, simply ensure your bread and broth are vegan-friendly and use olive oil instead of any butter. The rest of the ingredients are naturally plant-based and need no changes.

What can I use instead of dried cranberries?

If you don’t have dried cranberries, chopped dried cherries or raisins work well. They add similar sweetness and chewiness to contrast with the savory bread and squash.

How do I store leftovers so they don’t get soggy?

Cool the casserole completely before storing to prevent condensation. Use an airtight container and avoid sealing too tightly until it’s fully cooled. Reheat in the oven to help crisp up the breadcrumb topping again.

Final Thoughts

I can’t recommend trying this Butternut Squash Casserole with Sage, Cranberries, and Sourdough Breadcrumbs Recipe enough—its vibrant flavors and inviting textures make it a true showstopper. Whether you’re feeding a crowd or simply want to cozy up with a warm, nourishing side, this recipe brings both comfort and celebration to the table. Give it a go and watch it become your new fall classic!

Butternut Squash Casserole with Sage, Cranberries, and Sourdough Breadcrumbs Recipe

Ingredients You'll Need