Historical clue formulations

• "No problemo!" — 2020-04-03
• "It ain't hard!" — 2010-06-21
• What's C and easy, too? — 2004-02-22
• Dessert that's easy to prepare? — 2002-01-27
• "It was nothing, really" — 2002-01-12
• "It's a snap!" — 2001-10-02
• "Easy!" — 1999-09-28