Potato Mushroom Boursin Au Gratin - A Family Feast®

"This Potato Mushroom Boursin Au Gratin has tender slices of potatoes and mushrooms in a creamy and flavorful cheese sauce, topped with buttery bread crumbs...."

INGREDIENTS
2 tablespoons butter
2 tablespoons extra virgin olive oil, divided
12 ounces baby bella (cremini) mushrooms, sliced
1 tablespoon cognac
4 ounces pancetta, diced small
1 cup onions, diced
2 pounds Russet potatoes, half-inch diced
3 cups whole milk
2 5.2-ounce boxes garlic and herb Boursin cheese
2 tablespoons butter
1 cup panko bread crumbs
1 cup cheddar cheese, shredded
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