3 to 4 cups of mashed cooked sweet potatoes or garnet yams (from about 2 large sweet potatoes)*
1 lb of sliced cremini or button mushrooms
1/2 teaspoon salt
1/4 teaspoon freshly ground black pepper
1 1/2 cups (6 ounces) grated Gruyere cheese
20 saltine crackers
4 Tbsp butter, divided, plus more to grease the baking pan
*To cook the sweet potatoes, peel them, slice them into 1-inch thick disks, toss with some olive oil, place them in a single layer in a roasting dish covered with foil and roast them at 400°F for 20 minute or until fork tender. Or you can pierce the whole unpeeled sweet potatoes with a fork all over, wrap in foil and roast at 350°F for an hour or until fork tender. Or, you can peel and chop them and boil them until tender. Then mash.
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