Edge of Town and Double D's Diner both in El Dorado used to be pretty good.

Marchellos in Wichita is good Italian and good Burger in Wichita to me is Bionic Burger.

I like Pheasant Run Pancake Inn (I think that's the name) in Hays.

Bear House Cafe in Bunker Hill is great, and Made from Scratch (pretty sure that's the name) in Wilson, Ks is wonderful.