One-Pan Autumn Vegetable and Mushroom Rice Casserole

One-Pan Autumn Vegetable and Mushroom Rice Casserole

This one-pan autumn vegetable and mushroom rice casserole is a cozy, satisfying meal that deserves a place in your fall and winter rotation.

If you love easy dinners, a one-pan recipe is hard to beat. It saves time, keeps cooking simple, and delivers plenty of flavor. Best of all, you only have one pan to wash afterward, which makes the whole experience even better.

Cooking everything in a single skillet also helps build deeper flavor. As each ingredient is added, it layers into the dish and creates a rich, well-balanced result.

Why Seasonal Vegetables Make This Dish Better

Whenever possible, cooking with seasonal vegetables is a smart choice. They are often fresher, more flavorful, and better suited to the time of year.

That said, seasonal produce can vary depending on your location, so finding the right vegetables is not always straightforward.

Fortunately, mushrooms are available through much of the year because there are so many varieties. Even in colder months, you can usually find a good selection at the store.

Kale is another excellent ingredient in this casserole. It can be planted in spring, summer, and fall. Kale harvested after frost often tastes sweeter because the plant produces extra sugars as a natural defense against the cold.

The third key ingredient is butternut squash. While it is commonly available year-round, it is at its best from early fall through winter. When choosing one, look for a squash with a heavy bulb and a narrow neck. That usually means fewer seeds and more flesh.

Make It Vegetarian or Add Meat

One of the best things about hearty vegetables like squash, mushrooms, and kale is that they create a filling meal on their own. You may not even miss the meat.

Mushrooms, in particular, bring a savory, almost meaty depth that makes vegetarian dishes feel especially satisfying.

Still, this recipe is easy to customize. If you want to add extra protein, any of these options work well:

• Chicken
• Turkey
• Ground sausage

This flexibility makes the casserole a great choice whether you want a meat-free dinner or a more protein-rich meal.

The Best Rice for Mushroom Rice Casserole

For the best texture, use long-grain rice. It is less sticky than short- or medium-grain rice, which helps prevent the casserole from becoming too soft or mushy.

Long-grain rice is narrow and elongated, typically about four to five times longer than it is wide. Good options include:

• Basmati rice
• Jasmine rice
• Long-grain white rice
• Long-grain brown rice

You can also use wild rice if you want a nuttier flavor and firmer texture. Just keep in mind that wild rice takes longer to cook, so you will need to add about 10 to 15 extra minutes to the cooking time.

Why Stock Works Better Than Water

To cook the rice and create a creamy, flavorful base, this casserole uses stock instead of water.

Both chicken stock and vegetable stock work well. Either option adds seasoning and depth that plain water simply cannot provide.

A little dry white wine is also included to enhance the flavor even further. The alcohol cooks off during simmering, so it is still suitable for family meals. If you prefer not to use wine, just replace it with more stock.

How to Prepare This One-Pan Autumn Casserole

Before you start cooking, gather and prepare all your ingredients. Having everything ready makes the process much easier, especially in a recipe where everything goes into the same skillet.

Prep the vegetables

• Dice the onion
• Mince the garlic
• Slice the mushrooms
• Peel the butternut squash
• Cut the squash in half lengthwise
• Remove the seeds
• Chop the squash into 1-inch cubes
• Wash and tear or chop the kale into bite-size pieces

Cutting the squash into evenly sized pieces helps it cook properly in the oven without turning mushy before the rice is ready.

Measure your liquids

Before turning on the heat, measure out:

• The rice
• The stock
• The white wine

Be sure to check the recommended rice-to-liquid ratio on the rice package. This recipe uses basmati rice, but different long-grain varieties may need slightly more or less liquid.

Once everything is prepped, you are ready to start building flavor in your oven-safe skillet.

Prep Time

• Prep Time: 10 minutes
• Cook Time: 50 minutes
• Total Time: 1 hour

Ingredients

• 1 tablespoon neutral oil, such as grapeseed oil or avocado oil
• 1 onion, diced
• 3 cloves garlic, minced
• 1 pound baby bella mushrooms
• 1 cup butternut squash, cut into 1-inch pieces
• 1 1/2 cups kale, chopped or torn into bite-size pieces
• 1 cup basmati rice, or another long-grain rice
• 1 1/2 to 2 1/2 cups chicken or vegetable stock
• 1/2 cup dry white wine, such as Pinot Grigio
• 1/4 cup chopped parsley, for garnish
• 1/4 cup grated Parmesan or Pecorino, for garnish
• Kosher salt, to taste
• Ground black pepper, to taste

Instructions

1. Preheat the oven to 350°F.
2. Place a large oven-safe skillet over medium heat and add the oil.
3. Add the diced onion and cook for 5 to 8 minutes, stirring occasionally, until softened and translucent.
4. Stir in the garlic and cook for 1 minute, until fragrant. Season with salt and black pepper.
5. Add the mushrooms and cook for about 5 minutes, until they begin to caramelize slightly.
6. Mix in the butternut squash and cook for another 5 minutes.
7. Add the rice, 1 1/2 cups of stock, and the white wine. Stir well.
8. Bring the mixture to a boil over high heat, then reduce to medium-low and let it simmer after about 1 minute.
9. Add the kale and combine everything evenly.
10. Cover the skillet and let it simmer on the stovetop for 15 minutes.
11. Remove the lid and check the rice. If it is still firm or crunchy, add another 1/2 cup stock, cover again, and cook for 5 more minutes.
12. Once the rice is tender, uncover the skillet and adjust the seasoning with salt and pepper if needed.
13. Sprinkle the top with grated Parmesan or Pecorino.
14. Transfer the skillet to the oven and bake for 8 to 10 minutes, or until the cheese is melted.
15. Turn the broiler on high for a short time to lightly brown the cheese. Watch carefully so it does not burn.
16. Remove from the oven, top with chopped parsley, and serve.

Nutrition Information

Yield: 4 servings

Serving size: 1 portion

Per Serving

• Calories: 667
• Total Fat: 32g
• Saturated Fat: 8g
• Trans Fat: 0g
• Unsaturated Fat: 21g
• Cholesterol: 132mg
• Sodium: 572mg
• Carbohydrates: 44g
• Fiber: 6g
• Sugar: 6g
• Protein: 41g

Final Thoughts

This autumn vegetable and mushroom rice casserole is hearty, comforting, and full of flavor. It combines the earthy richness of mushrooms, the goodness of kale, and the natural sweetness of butternut squash in one easy skillet meal.

Whether you keep it vegetarian or add meat, this is a versatile one-pan dinner that makes the most of seasonal produce while keeping cleanup simple.