This is kind of my own twist on cottag fries with red and green bell pepper, usually called "O'Brien Potatoes".
I needed to make something like the O'Brien potatoes, but without the fancy shmancy pimentos, red bell peppers, etc. Some of us out here lack funds to go out and buy esoteric ingredients. Try this with the following warning: this recipe might be too hot/spicy for the non--pepper buff, so use the bell pepper if you can't take a tiny bit of heat.
I added the twist of using the Mexican Pasilla or Poblano (green) chili pepper, which tastes basically like a bell pepper but it is a little hot, although not like a jalapeño. If you are adventurous, try this with the Poblano. It gives a nice spicy bite to the potatoes and onion, but without burning your mouth out.