A one-step foundation powder...?

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Is there such a thing? I rarely wear make-up, but could probably do with putting something on on a daily basis. I really don't have time to do much in the mornings, and would preferably have something I can throw on at my desk without needing too much looking in the mirror.

Any suggestions? Am actually going to a city next week so can pop into Debenhams / Boots and speak to someone.