Oh yeah, this is it! Creamiest Mushroom Chicken Casserole is what you have been searching for. Nothing beats shredded chicken soaked up in the most delicious, creamy sauce. There are also a couple kinds of mushrooms and a bit of onion for variety and flavor. If you’re hungry for some serious yumminess, the Creamiest Mushroom Chicken Casserole will be calling!


  • 1/2 cup plus 2 tablespoons unsalted butter, divided
  • 1 (16-ounce) package fresh button mushrooms, sliced
  • 2 (4-ounce) packages fresh gourmet-blend mushrooms
  • 1/2 cup yellow onion, diced
  • 3 cloves garlic, minced
  • 1/2 cup all-purpose flour
  • 1 cup chicken broth, room temperature
  • 1 cup heavy whipping cream, room temperature
  • 4 ounces cream cheese, softened
  • 4 cups chicken breasts, boneless and skinless, cooked and shredded
  • 1 tablespoon plus 1/4 teaspoon kosher salt, divided
  • 1/2 teaspoon ground black pepper
  • 1/4 teaspoon celery salt
  • 2 cups sourdough bread, torn into pieces
  • fresh parsley, to taste, chopped, for garnish


Step 1 –Preheat the oven to 350 degrees F.

Step 2 –In a 12-inch ovenproof skillet over medium heat, melt 1/4 cup of the butter.

Step 3 –Add the button mushrooms, the gourmet-blend mushrooms, the onion, and the garlic and cook, stirring occasionally, until they are softened and lightly browned, about 12 minutes. Pour the mushroom mixture into a large bowl.

Step 4 –In the same skillet, melt 1/4 cup of the butter.

Step 5 –Whisk the flour into the melted butter and cook, whisking frequently, until it is lightly browned and smooth, about 5 minutes.

Step 6 –Gradually whisk the chicken broth and the heavy whipping cream into the flour-butter mixture until it is smooth.

Also Read:  Italy Coleslaw

Step 7 –Cook the sauce mixture, whisking constantly, until it is thick and bubbly, about 5 minutes.

Step 8 –Stir the cream cheese into the sauce mixture until it has melted.

Step 9 –Transfer the skillet from the heat, then stir the mushroom mixture, the chicken, 1 tablespoon of the salt, the black pepper, and the celery salt into the sauce.

Step 10 –In a medium microwave-safe bowl, melt the remaining butter on low heat.

Step 11 –Stir the bread and the remaining salt into the melted butter until the bread pieces are well-coated.

Step 12 –Sprinkle the chicken mixture with the bread mixture.

Step 13 –Bake the casserole until it is golden-brown and bubbly, about 25 minutes.

Step 14 –Transfer the skillet to a wire rack and let the casserole stand, about 10 minutes.

Step 15 –Serve the casserole garnished with the parsley.