Harvest casseroles have a unique way of embodying the spirit of comfort food. This Harvest Casserole with Chicken Sausage and Fall Veggies bursts with vibrant colors and flavors, beautifully showcasing seasonal ingredients. With tender butternut squash, caramelized Brussels sprouts, and aromatic herbs, every bite transports you to a cozy autumn evening. It’s the kind of dish that invites heartwarming gatherings, nourishing both body and soul with its wholesome ingredients and satisfying texture.

Table of Contents

Why You’ll Love This Recipe
Ingredients You’ll Need
How to Make Harvest Casserole
Storing & Reheating
Chef’s Helpful Tips
Recipe FAQs
Harvest Casserole

I remember the first time I discovered this recipe; it was during a chilly family gathering, and the aroma wafting from the kitchen drew everyone in. The harmony of savory chicken sausage with earthy vegetables and the sweet crunch of apples creates a dish that’s not only pleasing to the palate but also visually stunning. What makes this dish a winner is not just its ease of preparation but also the way it serves as a perfect side or main when you have friends and family over. Trust me, this Harvest Casserole is sure to become a beloved staple in your home.

Why You’ll Love This Recipe

Simple & Quick: Toss everything together and let the oven do the work. It’s ready in about an hour!
Irresistible Flavor: The toasted pecans and caramelized vegetables add a delightful crunch, making every bite satisfying.
Eye-Catching Appeal: The vibrant colors of the butternut squash and Brussels sprouts make it a feast for the eyes.
Flexible Serving: Perfect for hearty weeknight dinners or special holiday gatherings.
Diet-Friendly Options: Naturally gluten-free, dairy-free, and Whole30 compliant, this dish accommodates various dietary preferences.

Ingredients You’ll Need

3 cups butternut squash, cut into 1” cubes: This sweet and nutty squash is the star of the dish, providing a comforting flavor.
1 lb Brussels sprouts, halved or quartered: These Brussels sprouts add earthiness and a slight bitterness that balances the sweetness of the squash.
4 tablespoons olive oil, divided: Extra virgin olive oil works best for roasting, adding richness and helping to caramelize the veggies.
Sea salt and black pepper: Essential for enhancing the natural flavors of all the ingredients.
1 small yellow onion, diced: Offers sweetness and depth of flavor when cooked.
4 cloves garlic, minced: This aromatic ingredient adds a warm and inviting fragrance.
6 links chicken sausage, cut into coin shapes: Provides a savory, meaty element, making the casserole hearty. Look for Whole30 compliant options if you’re following that diet.
2 teaspoons fresh rosemary, minced: This fragrant herb adds a wonderful woodsy flavor.
2 teaspoons fresh sage, minced: Complements the dish with a touch of earthiness.
1 teaspoon thyme leaves: A timeless herb that rounds out the bouquet of flavors.
2 teaspoons fresh parsley, minced: Brightens the dish with its fresh taste and adds visual appeal.
2 cups cauliflower rice, fresh or frozen: This low-carb alternative helps bulk up the casserole and adds fiber. If using frozen, ensure it’s thawed and pressed to remove excess moisture.
1 apple (Honey Crisp or similar), finely diced: This adds a surprising sweetness and crunch.
1/2 cup pecans, chopped: Toast these before adding to enhance their flavor and crunch.
1/2 cup dried cranberries, juice-sweetened (for Whole30): Provides a pop of sweetness and chewiness, balancing the savory elements.
1/2 teaspoon cinnamon: A warm spice that enhances the fall flavors beautifully.
Fresh herbs for garnish, if desired: A sprinkle of fresh herbs adds a touch of color and brightness right before serving.

How to Make Harvest Casserole

Preheat the oven: Start by preheating your oven to 425°F. Line two baking sheets with parchment paper. This will save you time on cleanup later!
Roast the veggies: Spread the butternut squash on one baking sheet and the Brussels sprouts on the other. Drizzle both with 1 tablespoon of olive oil each, then sprinkle generously with sea salt and black pepper. Bake in the preheated oven for 25 minutes, stirring the Brussels sprouts halfway through so they brown evenly. If you prefer your Brussels sprouts less browned, feel free to remove them early. Once roasted, reduce the oven temperature to 400°F.
Cook the sausage mixture: While the veggies roast, heat a large skillet over medium heat and add the remaining 2 tablespoons of olive oil. Sauté the diced yellow onion until it becomes translucent, then add the minced garlic and cook for another 30 seconds until fragrant. Stir in the chicken sausage and the fresh herbs (rosemary, sage, thyme) and cook until the sausage is browned on the outside.
Add cauliflower and fruits: Incorporate the cauliflower rice, diced apple, chopped pecans, and cinnamon into the sausage mixture. Stir occasionally until the cauliflower rice and apples have softened, about 5-7 minutes. Finally, mix in the dried cranberries and season with salt and pepper to taste, then remove from heat.
Combine and bake: Spray a 9 x 13-inch baking dish with cooking spray. In the dish, combine the sausage mixture with the roasted butternut squash and Brussels sprouts. Spread it evenly and bake in the oven for an additional 12-15 minutes or until the top is toasty and heated through. If you like a little extra crunch, you can even give it a quick broil at the end.

Stir in some fresh herbs right before serving, and you’ll have a meal that’s not only delicious but also visually stunning! Enjoy this warm, hearty casserole as a delightful main or side dish.

Storing & Reheating

Leftovers can be kept at room temperature for up to two hours; after that, they should be refrigerated. Store in an airtight container in the fridge for up to 3-4 days. If you want to keep it longer, you can freeze it for up to three months—just be sure to wrap it well. When you’re ready to enjoy it again, simply reheat in the oven at 350°F for about 20-25 minutes, or until warmed through. Note that the texture may change slightly when reheating, but a splash of olive oil will help refresh it.

Chef’s Helpful Tips

Don’t overcook the Brussels sprouts when roasting; you want a bit of crunch!
If you can’t find cauliflower rice, you can easily make your own by pulsing cauliflower florets in a food processor until they resemble grains.
Feel free to add different vegetables like carrots or sweet potatoes if that’s what you have on hand.
For a slightly spicier kick, consider using spicy chicken sausage.
You can prepare the casserole ahead of time; just assemble it and store it in the fridge before baking. It’s perfect for holiday gatherings!

Harvest Casserole is a beautiful way to embrace the flavors of the season while bringing people together. The hearty mix of vegetables and chicken sausage creates a satisfying dish that’s also wonderfully versatile — enjoy it on a chilly evening with loved ones or as a standout side at a holiday feast. No matter how you serve it, this recipe is sure to become a favorite.

Recipe FAQs

Can I use another type of sausage in this casserole?

Absolutely! While chicken sausage gives a lovely flavor, you can easily substitute it with turkey sausage or even a vegetarian option if you prefer.

Can I make this casserole ahead of time?

Yes! You can assemble the casserole a day in advance and store it covered in the refrigerator. Just bake it when you’re ready to enjoy.

What can I substitute for butternut squash?

If butternut squash isn’t available, sweet potatoes or acorn squash make excellent alternatives. They will all lend that comforting sweetness that complements the other ingredients.

Is this casserole suitable for meal prep?

Definitely! This dish reheats well, making it a perfect candidate for meal prepping. Prepare a big batch, portion it out, and enjoy it throughout the week!

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Harvest Casserole

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Author: Peter
Prep Time: 15 minutes
Cook Time: 40 minutes
Total Time: 55 minutes
Yield: 8 servings 1x
Category: Main Dishes
Method: Baking
Cuisine: American

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Description

Savor the comforting flavors of this Harvest Casserole, featuring chicken sausage, butternut squash, and fresh fall veggies. Perfect for a family dinner or holiday gathering, it combines wholesome ingredients for an effortless and delicious homemade meal.

Ingredients

Scale

3 cups butternut squash cut into 1” cubes
1 lb brussels sprouts halved or quartered
4 tablespoons olive oil divided
Sea salt and black pepper to taste
1 small yellow onion diced
4 cloves garlic minced
6 links chicken sausage cut into coin shapes
2 teaspoons fresh rosemary minced
2 teaspoons fresh sage minced
1 teaspoon thyme leaves
2 teaspoons fresh parsley minced
2 cups cauliflower rice fresh or frozen
1 apple finely diced
1/2 cup pecans chopped
1/2 cup dried cranberries juice-sweetened
1/2 teaspoon cinnamon

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Instructions

Preheat your oven to 425°F and line 2 baking sheets with parchment paper. Place the squash on one sheet and the Brussels sprouts on the other.
Drizzle both with one tablespoon each of olive oil and sprinkle with salt and pepper. Bake for 25 minutes, stirring Brussels sprouts halfway through. After baking, reduce the heat to 400°F.
In a large skillet over medium heat, add the remaining 2 tablespoons of olive oil. Cook the diced onions until translucent, then add minced garlic for about 30 seconds.
Stir in the chicken sausage and fresh herbs, cooking until the sausage is browned.
Add the cauliflower rice, diced apples, chopped pecans, and cinnamon. Stir until the cauliflower rice and apples begin to soften. Add cranberries and season with salt and pepper, then remove from heat.
Spray a 9 x 13” baking dish with cooking spray and combine the sausage rice mixture with the roasted squash and sprouts in the dish.
Bake in the preheated oven for 12-15 minutes or until the top is toasty. Garnish with fresh herbs if desired and serve as a main or side dish.

Notes

For a vegetarian version, substitute chicken sausage with your choice of meat alternatives.
Ensure the cranberries are juice-sweetened for Whole30 compliance.
This casserole makes great leftovers; store in the refrigerator for up to 3 days.