Preheat oven to 350°.
Pierce potatoes with a fork; arrange in a circle on paper towels in microwave oven. Microwave at HIGH 16 minutes or until tender, rearranging potatoes after 8 minutes. Let stand 5 minutes.
Cut each potato in half lengthwise; scoop out pulp into a large bowl. Discard skins. Add sugar and next 5 ingredients (sugar through nutmeg), and beat with a mixer at low speed until combined. Add eggs; beat until smooth.
Spoon mixture into a 1 1/2-quart baking dish; sprinkle with pecans. Bake at 350° for 45 minutes or until thoroughly heated.