Best Vegetarian Mushroom Casserole Recipes for Every Occasion

Mushroom casseroles are the ultimate comfort food, especially for vegetarians craving a hearty, flavorful dish that satisfies both the palate and the soul. These casseroles combine the earthiness of mushrooms with creamy, cheesy, and savory ingredients baked to perfection, creating a dish that’s perfect for family dinners, potlucks, or cozy nights in.

Whether you’re a mushroom enthusiast or just looking to incorporate more plant-based meals into your routine, these recipes will become staples in your kitchen. Plus, casseroles are incredibly versatile—you can customize them with different mushroom varieties, spices, and toppings to suit your taste.

In this post, we’ll explore the best vegetarian mushroom casserole recipes that are easy to make, packed with nutrients, and bursting with flavor. From classic creamy mushroom bakes to exotic twists featuring fresh herbs and crunchy toppings, there’s something here for every mushroom lover.

So grab your apron, and let’s dive into these delicious, wholesome, and utterly satisfying casseroles!

Why You’ll Love This Recipe

Mushroom casseroles are a fantastic way to enjoy a meatless meal that doesn’t compromise on richness or texture. The mushrooms bring a meaty, umami-packed flavor that perfectly complements creamy sauces and crisp toppings.

These casseroles are also:

• Nutritious: Packed with vitamins, minerals, and fiber from mushrooms and vegetables.
• Comforting: Warm, hearty, and ideal for cooler weather or whenever you want a cozy meal.
• Easy to customize: Swap mushrooms, cheese, and herbs to match your preferences or what you have on hand.
• Great for leftovers: They reheat beautifully and taste even better the next day.

Plus, these casseroles are perfect for entertaining or weekly meal prep. If you love recipes like this, be sure to check out other favorites like our Classico Sun Dried Tomato Alfredo Sauce Recipe or try a sweet treat afterward with the Cinnamon Pecan Ice Cream Recipe.

Ingredients

Classic Creamy Vegetarian Mushroom Casserole

• 2 tablespoons olive oil
• 1 pound mixed mushrooms (cremini, button, shiitake), sliced
• 1 medium onion, finely chopped
• 3 cloves garlic, minced
• 1 cup creamed spinach (optional)
• 1 cup sour cream or Greek yogurt
• 1 cup shredded cheddar cheese
• 1/2 cup grated Parmesan cheese
• 1/2 cup breadcrumbs
• 1 teaspoon dried thyme
• Salt and black pepper, to taste
• Fresh parsley, chopped for garnish

Hearty Mushroom and Lentil Casserole

• 1 cup cooked green or brown lentils
• 3 cups mushrooms, chopped
• 1 medium carrot, diced
• 1 celery stalk, diced
• 2 tablespoons olive oil
• 1 cup vegetable broth
• 2 tablespoons tomato paste
• 1 teaspoon smoked paprika
• 1 teaspoon dried rosemary
• 1 cup shredded mozzarella or vegan cheese
• Salt and pepper to taste

Cheesy Wild Mushroom and Potato Casserole

• 4 medium potatoes, thinly sliced
• 2 cups wild mushrooms, cleaned and sliced
• 1 cup heavy cream or plant-based cream
• 1 cup grated Gruyère or Swiss cheese
• 2 tablespoons butter
• 1 teaspoon garlic powder
• Fresh thyme leaves
• Salt and pepper, to taste

Equipment

• Large skillet or sauté pan for cooking mushrooms and vegetables
• Mixing bowls for combining ingredients
• 9×13-inch baking dish or equivalent casserole dish
• Measuring cups and spoons
• Sharp knife and cutting board
• Oven mitts for safe handling
• Aluminum foil, optional for covering casserole while baking

Instructions

Classic Creamy Vegetarian Mushroom Casserole

1. Preheat your oven to 375°F (190°C). Lightly grease your baking dish.
2. Heat olive oil in a large skillet over medium heat. Add the chopped onion and sauté until translucent, about 5 minutes.
3. Add garlic and mushrooms to the skillet. Cook, stirring frequently, until mushrooms release their moisture and begin to brown, about 8-10 minutes.
4. Season with thyme, salt, and pepper. Stir in the creamed spinach if using.
5. Remove from heat and stir in sour cream and half of the cheddar cheese.
6. Transfer the mixture into the baking dish. Sprinkle the remaining cheddar and Parmesan cheese evenly on top.
7. Top with breadcrumbs for a delicious crunchy crust.
8. Bake uncovered for 25-30 minutes, until the top is golden and bubbly.
9. Garnish with fresh parsley before serving.

Hearty Mushroom and Lentil Casserole

1. Preheat oven to 350°F (175°C) and grease a casserole dish.
2. Sauté onion, carrot, and celery in olive oil until soft, about 7 minutes.
3. Add mushrooms and cook until tender and browned.
4. Stir in cooked lentils, tomato paste, smoked paprika, and rosemary. Pour in vegetable broth and simmer for 5 minutes.
5. Season with salt and pepper.
6. Transfer to casserole dish, top with shredded cheese.
7. Bake for 20-25 minutes until bubbly and cheese is melted.

Cheesy Wild Mushroom and Potato Casserole

1. Preheat oven to 400°F (200°C). Butter your baking dish.
2. Layer half of the sliced potatoes at the bottom of the dish. Season with salt, pepper, and garlic powder.
3. Sauté mushrooms in butter until golden and fragrant. Add thyme leaves.
4. Spread mushrooms evenly over the potatoes.
5. Layer remaining potatoes on top and pour cream over everything.
6. Sprinkle Gruyère cheese on top.
7. Cover with foil and bake for 40 minutes. Remove foil and bake another 15 minutes until golden and bubbly.

Tips & Variations

“For the best flavor, use a variety of mushrooms such as shiitake, cremini, and portobello to add depth and texture.”

• Use vegan cheese and sour cream alternatives for a dairy-free version.
• Add nuts like toasted walnuts or pecans on top for extra crunch and nutrition.
• Mix in fresh herbs such as rosemary, thyme, or sage to complement the mushrooms.
• Boost protein by adding cooked quinoa or chickpeas to your casserole.
• Try different toppings: crushed crackers, panko breadcrumbs, or even fried onions for a twist.

For more cozy vegetarian dishes, you might enjoy our Costco Vegan Mushroom Stew Recipe or a unique twist on casseroles in the Collard Green Casserole Recipes.

Nutrition Facts

These casseroles provide a balanced mix of macronutrients with a good dose of fiber and protein from mushrooms, lentils, and vegetables. To lower calories, opt for low-fat dairy or plant-based alternatives and reduce the amount of cheese used.

Serving Suggestions

• Serve your mushroom casserole with a crisp green salad dressed with lemon vinaigrette for freshness.
• Pair with crusty bread or garlic toast to soak up the creamy sauce.
• Complement the dish with roasted seasonal vegetables for a colorful plate.
• For a festive touch, garnish with fresh herbs and a sprinkle of grated cheese right before serving.

Looking for a perfect dessert to follow? Try the indulgent Chocolate Heaven Cake Recipe for a sweet finale.

Conclusion

Vegetarian mushroom casseroles are an unbeatable blend of comfort, flavor, and nutrition. These recipes offer a wonderful way to enjoy the rich umami taste of mushrooms combined with creamy textures and crispy toppings.

Whether you prefer a simple classic or a hearty lentil-packed casserole, these dishes are sure to become favorites for your family and friends. Not only are they satisfying and delicious, but they also make excellent leftovers that taste just as good—or better—the next day.

With easy-to-follow instructions, versatile ingredients, and plenty of room for creative variations, mushroom casseroles are a must-try for any vegetarian or mushroom lover. Don’t forget to explore other delightful recipes on our blog, including the savory Cheese Penny Recipe and the refreshing Chicken Shrimp And Broccoli Recipes (vegetarian options included).

Happy cooking!

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