how long do you need to put a yam in the microwave to cook
1 Microwave on high for 8 to 10 minutes or until tender, turning the yams once. 2  To microwave sliced yams: Wash, peel, and cut off the woody portions and ends. 3  Cut yams into quarters. 4  Place the yams and 1/2 cup water in a microwave-safe casserole.ake the Yams. 1  Place half the yams in a 1-quart casserole. 2  Layer with half the brown sugar and half the margarine. 3  Repeat the layers. 4  Bake, uncovered, in a 375 degree F oven for 30 to 35 minutes or until the yams are glazed, spooning the liquid over the yams once or twice during cooking.