4 gruyere oyster gratin Recipes

unsalted butter, plus more for baking dish, onion, finely diced, mushrooms (such as shiitake, chanterelle, oyster), washed, dried, and coarsely chopped, white wine, salt (to taste), freshly ground black pepper, grated gruyere cheese, grated parmesan cheese, yukon gold potatoes, peeled, fresh thyme, heavy cream

butter, chopped mixed wild mushroom (cremini, shiitake, and oyster), sliced onion, fresh thyme, chopped (optional), all-purpose flour, cream, beef stock, reduced sodium, thick slices baguette, gruyere cheese, blue cheese, crumbled, chives, finely chopped

butter, oyster mushrooms, halved if large, minced garlic, sliced leeks (white and pale green parts only; about 4 large), minced fresh thyme, canned low-salt chicken broth, whipping cream, dry white wine, salt, ground black pepper, russet potatoes, peeled, thinly sliced into rounds (about 8 cups), grated gruyere cheese (about 10 oz)