What types of mushrooms work best for making mushroom casserole?

The best mushrooms for a mushroom casserole are Baby Bella (crimini) mushrooms because of their rich, earthy flavor and firm texture. White button mushrooms are also a common choice and work well if you prefer a milder taste. Avoid using very delicate wild mushrooms that may become too soft when cooked. Using about 32 ounces of mushrooms provides the perfect amount for a standard 2-quart casserole dish.

Should mushrooms be cooked before adding them to the casserole?

Yes, it’s important to sauté mushrooms with onions first. Cooking them over medium heat until they release their liquid and most of it evaporates prevents excess moisture from making the casserole watery. This step also enhances the mushrooms’ flavor and helps develop a richer texture in the finished dish.

Can I swap out olive oil for another fat when preparing mushroom casserole?

Absolutely. Butter or ghee are excellent alternatives to olive oil and add a creamy richness that complements the mushrooms. You can use the same amount as the recipe calls for with olive oil. These fats also help in sautéing the mushrooms and onions, providing depth to the overall flavor.

What cheeses can I use if I don’t have Gruyere for mushroom casserole?

Gruyere’s nutty and melty characteristics make it a great choice, but you can substitute sharp cheddar, Gouda, or provolone. These cheeses melt well and offer a good balance of flavor. Choose a cheese that melts smoothly and complements the earthiness of mushrooms without overpowering the dish.

How should I store and reheat leftover mushroom casserole?

To store leftovers, let the casserole cool completely, then transfer servings to an airtight container. Keep it refrigerated and consume within 4 days for best quality. Reheat in the microwave at 50% power to warm thoroughly without drying out the dish. Alternatively, you can reheat in a 350°F oven covered with foil for 15-20 minutes until heated through.

Mushroom Casserole Recipe With Creamy Sauce And Crispy Top

Name: Mushroom Casserole
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: American
Ingredients: ¼ cup olive oil for greasing the baking dish; 32 ounces (about 900 grams) baby Bella or crimini mushrooms; 1 cup chopped onions; 2 teaspoons kosher salt (or 1 teaspoon if using a different brand of kosher salt); 1 tablespoon fresh garlic, minced; ½ teaspoon black pepper; ½ teaspoon dried thyme; 1 cup shredded Gruyere cheese (alternatives include sharp cheddar, Gouda, or provolone); 1 teaspoon dried parsley for garnish

Ingredients

Scale

¼ cup olive oil for greasing the baking dish

32 ounces (about 900 grams) baby Bella or crimini mushrooms

1 cup chopped onions

2 teaspoons kosher salt (or 1 teaspoon if using a different brand of kosher salt)

1 tablespoon fresh garlic, minced

½ teaspoon black pepper

½ teaspoon dried thyme

1 cup shredded Gruyere cheese (alternatives include sharp cheddar, Gouda, or provolone)

1 teaspoon dried parsley for garnish

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Instructions

1-Preheat the oven to 400°F (200°C) and lightly grease a 2-quart (about 1.9 liters) baking dish with olive oil.

2-Heat ¼ cup olive oil in a large deep skillet over medium-high heat. Add the sliced mushrooms, chopped onions, and kosher salt. Cook while stirring occasionally for about 10 minutes until the mushrooms release their liquid and most of it evaporates.

3-Stir in the minced garlic, black pepper, and dried thyme, cooking for an additional minute before removing from heat.

4-Transfer the mushroom mixture to the prepared baking dish and evenly sprinkle the shredded cheese on top.

5-Bake in the preheated oven for approximately 15 minutes, until the casserole is hot and bubbly. Garnish with dried parsley before serving.

Last Step:

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Notes

🔥 For a golden, melted cheese topping, broil the casserole for 2-3 minutes if your dish is broiler-safe.
🍽️ Using brown mushrooms like baby Bella or crimini enhances both flavor and appearance compared to white mushrooms.
⏲️ Pre-sliced mushrooms and pre-chopped onions can help reduce prep time.
❄️ Store leftovers in an airtight container in the refrigerator for up to 4 days and reheat at half power in the microwave.

Author: Brandi Oshea
Prep Time: 10 minutes
Cook Time: 30 minutes
Category: Casserole
Method: Baking
Cuisine: American
Diet: Vegetarian

Nutrition

Serving Size: 1 serving
Calories: 200 kcal
Sugar: 4 g
Sodium: 441 mg
Fat: 15 g
Saturated Fat: 5 g
Unsaturated Fat: Not specified
Trans Fat: 0 g
Carbohydrates: 8 g
Fiber: 2 g
Protein: 10 g
Cholesterol: Not specified