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Stuffed Mushroom Casserole

Stuffed mushroom casserole is your favorite party appetizer but in casserole form! The mushrooms are cooked perfectly and seasoned nicely with garlic, Italian sausage, and Boursin. A cheesy, creamy sensation.

How to Make It

Preheat oven to 350 degrees F (175 degrees C). Gather all ingredients.

Heat 1 tablespoon of the oil in a large nonstick skillet over medium-high. Add sausage; cook, stirring often, until browned and crumbled, about 8 minutes.

Using a slotted spoon, transfer cooked sausage to a large bowl, leaving drippings in skillet.

Return skillet to medium-high. Add remaining 1 tablespoon oil to drippings. Add mushrooms; cook, stirring occasionally, until mushrooms are softened, browned, and have released most of their liquid, 8 to 10 minutes.

Add garlic; cook, stirring constantly, until fragrant, about 30 seconds. Stir in cream cheese and Gournay cheese; cook, stirring constantly, until cheese is melted and evenly coating mushrooms, about 2 minutes.

Transfer mushroom mixture to bowl with sausage, and stir in mozzarella and 1/2 cup of the Parmesan cheese until evenly combined.

Spoon into an even layer in a 13- x 9-inch baking dish coated with cooking spray.

Stir together panko, melted butter, and remaining 1/4 cup Parmesan cheese in a small bowl. Sprinkle evenly over top of mushroom mixture.

Bake in preheated oven until topping is golden, about 25 minutes. Sprinkle with parsley. Serve hot.

Ingredients

  • 2 tablespoons olive oil, divided

  • 1 1/2 pounds bulk hot Italian sausage

  • 1 1/2 pounds cremini mushrooms, trimmed and quartered

  • 1 1/2 tablespoons finely chopped garlic

  • 1 (8 ounce) package cream cheese, softened

  • 1 (5.2 ounce) package soft Gournay cheese product with basil & chives (such as Boursin)

  • 3 ounces pre-shredded low-moisture part-skim mozzarella cheese

  • 3 ounces Parmesan cheese, finely shredded, divided

  • cooking spray

  • 1 cup panko (Japanese-style breadcrumbs)

  • 2 tablespoons unsalted butter, melted

  • 2 tablespoons chopped fresh flat-leaf parsley

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