Your Kitchen Hacks?

[Photograph: Greenleaf Dollhouses]

Late last month, in the "Childhood Favorites: Guilty Pleasures?" thread, SE'er GirlFromJetCity made a comment that I bookmarked for future use:

Annie's mac and cheese (made with yogurt so it's tangy!)

I'd never thought of doing that, but it makes sense. I tried it the other day, and it really does make the mac tangy — thanks, GFJC! (Plus, lists it as a way to make boxed mac and cheese if you don't have milk or butter.)

Which leads me to this ... There are probably a lot of these tips out there rattling 'round in our heads. Let's get them out in the open, where they're useful. What kitchen tip(s) do you have worth passing on?