Mother’s twice-baked potatoes were done with butter, cheddar, milk, and a sprinkle of cayenne for color.

• 07.126 and twice-baked cakes that would keep good a long time,

Hyphenated in OED.

“twice, adv. (n. and adj.).” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/208027. Accessed 21 September 2017.