My Genius Nicer Dicer. It has large, medium, and small blades and makes it super easy to chop vegetables into uniform little cubes. Mr. Shrdlu doesn’t like chunks of onion, so if I use the small dicing blade the onions kind of disappear into whatever I’m making and he doesn’t even know they’re in there. I even have a teeny tiny version of the Nicer Dicer for garlic cloves.
Also: Reynolds Non-Stick Foil. I hoard this stuff because I am afraid they’ll discontinue it. Everything you cook on it just slides right off. Fantastic for cookies, making oven roasted chicken (the skin stays attached to the chicken, not the pan), biscuits, lining brownie pans, etc.