Baked Mushroom Casserole in a white baking dish garnished with parsley.
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4.34 from 3 votes

Baked Mushroom Casserole Recipe

This hearty mushroom casserole recipe checks all of the boxes, quick, easy, and delicious, and it pairs beautifully with beef, pork or chicken. Baked Mushroom Casserole would also make a wonderful vegetarian main course for dinner.
Prep Time10 mins
Cook Time30 mins
Total Time40 mins
Course: Side Dish
Cuisine: American
Keyword: casserole, dinner party ideas, dinner recipe, fancy side dish
Servings: 4 servings
Calories: 410kcal
Author: Sharon Rigsby


  • 6 Tbsp unsalted butter room temperature
  • 1 Tbsp chopped parsley fresh
  • 2 tsp lemon juice fresh
  • 1/2 tsp kosher salt
  • 1/8 tsp ground black pepper
  • 4 slices French bread 1/2-inch-thick (may need more to cover the bottom of baking dish)
  • 12 oz mixed mushrooms sliced
  • 1/2 cup heavy cream


  • Preheat your broiler to high and toast the French bread slices until they are lightly browned on both sides. Reduce the oven heat to 375 degrees F.
  • Add the room temperature butter, parsley, lemon juice, salt, and pepper to a small bowl and mix well. Take up to half of the butter mixture and liberally spread on one side of the toast slices. Set the remaining butter mixture aside.
  • Cover the bottom of a small shallow baking dish or gratin dish with a single layer of buttered slices of toast.
  • Top the toast with the mushroom slices and spread out evenly.
  • Melt the remaining butter mixture in the microwave or on the stove and drizzle over the mushrooms. Drizzle the heavy cream evenly over the mushrooms.
  • Cover the dish tightly with foil or a lid and bake for approximately 30 minutes or until the mushrooms are done.
  • Optional, garnish with additional chopped parsley.
  • Serve hot!


Sharon's Expert Tips:
  • You can use pretty much any variety of mushrooms in this casserole. I was lucky to find a mixture of prepackaged mushrooms that were already sliced at the store, but you can use just one type if that's what you have on hand. White button mushrooms, which are the most common, would work well. Creminis, which are just baby portabellas, would also be delicious.
  • Depending on how large your loaf of French bread is, and the size of your baking dish, you might need more than four slices. Don't jam them in, they should just fit comfortably in one layer.
  • Sliced sourdough bread can be substituted for the French bread.
  • You can substitute dried parsley flakes for the fresh parsley in this recipe. Because dried herbs are stronger than fresh only use one teaspoon of dried parsley.
Nutrition information can vary for a recipe based on factors such as precision of measurements, brands, ingredient freshness, or the source of nutrition data. We strive to keep the information as accurate as possible but make no warranties regarding its accuracy. We encourage readers to make their calculations based on the actual ingredients used in your recipe, using your preferred nutrition calculator, especially those with dietetic allergies and food-related diagnoses.


Calories: 410kcal | Carbohydrates: 30g | Protein: 8g | Fat: 29g | Saturated Fat: 18g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Cholesterol: 86mg | Sodium: 568mg | Potassium: 352mg | Fiber: 3g | Sugar: 2g | Vitamin A: 1050IU | Vitamin C: 4.1mg | Calcium: 60mg | Iron: 1.8mg