Hearty Kale Wild Rice and Mushroom Casserole is a comforting vegetarian recipe for Meatless Monday or a flavorful holiday side.
I’ve always loved casseroles, even though I don’t make them nearly as often as I should. They’re the ultimate comfort food, warm, hearty, and served in one dish. This Kale Wild Rice and Mushroom Casserole is a flavorful vegetarian recipe that’s perfect for winter nights, holiday gatherings, or your next Meatless Monday.
Made with earthy mushrooms, tender kale, nutty wild rice, and creamy Gruyère cheese, this casserole is nourishing, filling, and deeply satisfying.
Why You’ll Love This Vegetarian Casserole
One of my favorite things about casseroles is how easy they are to prepare and clean up. While this one bakes in the oven, I usually have time to wash the prep dishes so that only the serving plates and utensils remain. That makes dinner feel just a little bit easier.
One of the best things about casseroles is how easy they are to make ahead. I usually assemble this one the night before, refrigerate it, and simply bake it when it’s time to eat. It’s ideal for busy weeknights, easy holiday meals, or bringing to a potluck.
This vegetarian kale wild rice and mushroom casserole is a dish David and I enjoyed for Meatless Monday, but it’s so hearty that even meat-lovers won’t miss the protein. Serve it as a main dish or as a flavorful side, either way, it’s sure to be a hit at the table.
What You’ll Need To Make This Recipe
The combination of nutty wild rice, hearty kale, and savory mushrooms creates a rich base full of flavor and texture. I love how the Gruyère cheese melts into everything, adding just the right amount of creaminess and depth. A touch of garlic and onion brings it all together, turning humble ingredients into something truly special.
Wild Rice: Adds a nutty flavor and hearty texture that makes the casserole satisfying and wholesome.
Kale: Brings color, nutrients, and a pleasant balance to the rich sauce.
Mushrooms: Give the dish an earthy, “meaty” flavor—perfect for a vegetarian meal.
Onion & Garlic: Add warmth and depth, building a savory base for the casserole.
Red Pepper Flakes: A touch of gentle heat to brighten the flavors.
Flour: Helps thicken the creamy sauce for that perfect comfort-food texture.
Vegetable Broth: Deepens the flavor while keeping it fully vegetarian.
Half-and-Half: Makes the sauce creamy and smooth without feeling too heavy.
Gruyère Cheese: Melts into the casserole with nutty, rich flavor. It’s pure comfort.
Olive Oil, Salt & Pepper: Simple essentials that bring everything together.
How To Make Kale Wild Rice and Mushroom Casserole
- Preheat & Prep: Preheat oven to 350°F and lightly grease a 2-quart casserole dish.
- Cook Veggies: Sauté onion, garlic, mushrooms, red pepper flakes, salt, and pepper in olive oil until soft and fragrant (10–15 minutes).
- Add Kale: Stir in kale a handful at a time, letting each batch wilt.
- Make Sauce: Sprinkle in flour, cook 1 minute, then gradually whisk in broth and half-and-half until thickened.
- Combine: Stir in cooked wild rice and half the Gruyère cheese.
- Assemble & Bake: Transfer mixture to the casserole dish, top with remaining cheese, and bake 25 minutes until bubbly and golden.
- Serve: Let cool 10 minutes before serving.
Tips for the Best Kale Wild Rice and Mushroom Casserole
- Make It Ahead: Assemble the casserole a day in advance and refrigerate. Bake it straight from the fridge.
- Cook the Rice First: Use fully cooked wild rice so the casserole bakes evenly and the rice stays tender. Leftover rice works perfectly here.
- Wilt Kale Gradually: Add the kale in batches, letting each portion wilt before adding more. This keeps it tender without overcooking.
- Cheese Options: Gruyère is ideal for its nutty, melty flavor, but Swiss or Fontina are tasty alternatives if you prefer.
- Add Extra Flavor: A splash of soy sauce, Worcestershire (vegetarian version if desired), or a pinch of smoked paprika can deepen the casserole’s savory flavor.
- Make It Spicy (Optional): Adjust red pepper flakes to taste for a little heat, or leave them out for a milder version.
- Leftovers Are Delicious: Refrigerate any leftovers and reheat in the oven or microwave. I like it bette, because the flavors get all happy and meld together.
- Freezing Tip: This casserole freezes well. Bake first, then cool completely and store in an airtight container for up to 2 months.
Whether you serve it as the star of the show or alongside your holiday favorites, this kale wild rice mushroom casserole will become a recipe you’ll return to all season long.
With love and flavor,
Kale Wild Rice and Mushroom Casserole
Ingredients
- 3 tablespoons extra virgin olive oil
- 1 cup yellow onion chopped
- 1 tablespoon fresh garlic minced
- 8 ounce package wild mushrooms sliced
- Kosher salt and freshly cracked black pepper to taste
- ¼ teaspoon crushed red pepper
- 1 bunch fresh kale ribs and stems removed; chopped (about 8 cups)
- ¼ cup all-purpose flour
- 2 cups vegetable broth
- 1 ½ cups half-and-half
- 1 cup shredded Gruyère cheese divided
- 2 ½ cups cooked wild rice
Instructions
- Preheat oven to 350 degrees F. Grease a 2-quart casserole dish; set aside.
- Heat oil in a large nonstick skillet over medium heat. Add the onion, garlic, mushrooms, the red crushed pepper and season with salt and pepper to taste. Saute, stirring occasionally until onions are translucent and soft; about 10 to 15 minutes.
- Add the kale to the mushroom mixture in batches. Stir each batch until wilted before each addition.
- Stir in flour; cook 1 minute. Pour the broth in gradually and then add the half-and-half. Stir constantly until thickened; about 5 minutes. Add half of the cheese and the cooked rice, stir well to combine.
- Spoon the mixture into prepared casserole dish and sprinkle with the remaining cheese.
- Bake for about 25 minutes or until the cheese has melted and bubbling.
- Allow the casserole to cool 10 minutes before serving.
Notes
- Make It Ahead: Assemble the casserole a day in advance and refrigerate. Bake it straight from the fridge.
- Cook the Rice First: Use fully cooked wild rice so the casserole bakes evenly and the rice stays tender. Leftover rice works perfectly here.
- Wilt Kale Gradually: Add the kale in batches, letting each portion wilt before adding more. This keeps it tender without overcooking.
- Cheese Options: Gruyère is ideal for its nutty, melty flavor, but Swiss or Fontina are tasty alternatives if you prefer.
- Add Extra Flavor: A splash of soy sauce, Worcestershire (vegetarian version if desired), or a pinch of smoked paprika can deepen the casserole’s savory flavor.
- Make It Spicy (Optional): Adjust red pepper flakes to taste for a little heat, or leave them out for a milder version.
- Leftovers Are Delicious: Refrigerate any leftovers and reheat in the oven or microwave. I like it bette, because the flavors get all happy and meld together.
- Freezing Tip: This casserole freezes well. Bake first, then cool completely and store in an airtight container for up to 2 months.
Dana @ IveGotCake says
I also clean as I go for the exact same reason because who wants to be bothered with the cleanup afterwards??
Great choice of veggies for this casserole too!!
The Mountain Kitchen says
Hey Dana! Yes!!! Clean as you go!! Thanks for stopping by. 🙂