- Wash hands with soap and water.
- Heat oil in a large skillet over medium heat. Add peppers and onion and sprinkle with salt and pepper.
- Stir a few times while cooking, until onion is clear and peppers are tender, about 8 to 10 minutes.
- Refrigerate leftovers within 2 hours.
- Serve as a side dish; add to sandwiches, tacos or wraps; add to cooked pasta or rice bowls.