Roasted Mushroom Stroganoff

Ingredients (17)

• 2 pounds cremini mushrooms , (or a mix of cremini and bay bella mushrooms), thickly sliced
• 6 tablespoons extra virgin olive oil , divided
• 1 teaspoon kosher salt , divided
• 1/2 teaspoon freshly ground black pepper , divided
• 6 sprigs plus 1 teaspoon fresh thyme
• 12 ounces dry pappardelle pasta
• 3 tablespoons unsalted butter
• 1 large shallot , finely chopped
• 3 cloves garlic , minced
• 3 tablespoons all purpose flour
• 1 cup dry cooking sherry
• 1 cup vegetable stock , (made with Better Than Bouillon Seasoned Vegetable Base OR Mushroom Base)
• 2 tablespoons less sodium soy sauce
• 1 tablespoon Dijon mustard
• 1/2 cup créme fraîche
• 1/4 cup heavy cream , optional
• 1/4 cup fresh chives , finely chopped (or snipped with kitchen shears), for serving