A yummy baked mushroom side dish.
Make and share this Mushroom Gratin recipe from Food.com.
- Preheat oven to 425.
- Heat butter in a skillet over medium-low heat. When butter is foamy, add mushrooms and cook until lightly browned, stirring frequently.
- In a bowl, whisk together the sour cream, egg yolk, and salt and pepper; stir this into the mushrooms. Heat through, stirring frequently.
- Pour the mixture into a baking dish and sprinkle with the parsley and shredded cheeses.
- Bake at 425 for about 12 minutes, until cheese is melted.