not tryed this base form this site but might be of some interest.

"A Mild Indian Curry Sauce Base
Just Like The Pros Make
A mild Indian curry is like an oxymoron to some people. "You can't call that a curry!", they say. But you know what? Not every Indian curry has to leave your ears ringing, your eyes watering and your mouth feeling like the entrance to Hell itself."


http://www.currysafari.com/mild-indian-curry.html

Weird. Its almost a base recipe that becomes its own final curry. A lot of similarities to  some of the bases here.

Not sure about a teaspoon of cinnamon though (same amount as the cumin). Cinnamon can overpower a dish in quantity.