Best Huevos Rancheros in Boston?
Being an unabashed and hopeless Southwestern food snob, I'd pick up some cans of Hatch chile at Whole Foods (or even better, 505 brand from Pemberton Farms in Cambridge) and make it at home.
Best I've had out is a slightly fancy version at Tu y Yo in Somerville. I feel like slow-cooked sauces are Tu y Yo's strongest suit, which will be particularly evident in a relatively simple dish like huevos rancheros.
Here's their breakfast/brunch menu: