Heat a skillet over medium high heat, add oil of choice. When oil is hot, add the sweet potatoes, stirring to coat with the oil. Let them sit undisturbed for a minute so that they can start to sear. After they have seared for a minute or so, stir and cook for several more minutes, until they just start to soften and become golden.
Add the peppers to the pan and cook for a few more minutes, stirring frequently.
Add the onions last, continuing to stir frequently, keeping an eye to make sure the sweet potatoes are not starting to burn. Reduce heat to medium low if needed.
Add salt, pepper, paprika and red pepper flakes, adjust to taste. Toss to coat. Hash is done when onions are soft and starting to caramelize.