Add the oil to a skillet set over medium high heat.
Place the sausage links into the skillet and cook, turning occasionally until the sausage is browned and about half-way cooked.
Remove the sausage from the pan and set aside.
Add the onions and peppers to the hot pan and cook for 3 to 5 minutes or just until the onions begin to wilt a little, stirring frequently. Add the garlic and cook for another 2 minutes.
Return the sausage to the skillet, mix with the peppers and onions, then cover with a lid and reduce heat to low.
Remove the lid and stir every 5 minutes or so until the sausages are cooked completely through. If in doubt, check with an instant read thermometer for 160 Degrees F in the middle of a sausage.
Remove from the heat and serve.
Notes
Sausage and peppers may be kept warm by placing in an electric skillet, crock pot or slow cooker set to the lowest setting possible. If using the stovetop to keep the sausage warm, stir frequently to avoid burning.Bell peppers can be red, green, orange, yellow, or a combination.