Tavelli has several branches in Santiago and do a menu of main dish/dessert/drink and coffee for about $10 US. They have good salads.

Coppelia is another place with branches around town.

Downtown you have several small places for coffee plus something to eat. Café del Parque on José Miguel de la Barra near the Parque Forestal, the traditional Confitería Torres on Avenida Libertador Bernardo O'Higgins 1576, the Emporio La Rosa, Merced 291 (on the corner of Monjitas) which is ideal for empanadas, salads or pasta. There are a number of places around the Cerro Santa Lucia/Parque Forestal/Lastarria area, all individually owned and not chains.

This information is based on the forum thread: