INGREDIENTS
1 tbsp
extra-virgin olive oil
1 tbsp
unsalted butter
1 lb
mixed fresh mushrooms (shiitakes, cremini, white), washed, trimmed & sliced 1/4-inch thick (5 to 6 cups)
2 cloves
garlic, minced
1/2 tsp
kosher salt
2 tbsp
chopped fresh flat-leaf parsley
freshly ground black pepper
2
to 3 tablespoons heavy whipping cream, broth or lemon juice
additional chopped herbs (optional)
1 tbsp
unsalted butter, softened at room temperature
1 cup
low-sodium chicken broth
1 cup
heavy whipping cream
2 1/2 lb
russet potatoes
1 tbsp
chopped fresh thyme
2 1/2 tsp
kosher salt
freshly ground black pepper
1/2 cup
(about 2 ounces) finely grated Gruyère cheese