Heat the olive oil in a large skillet over medium-high heat.
Add the potatoes and spread them into an even layer across the bottom of the pan. Let cook undisturbed for 5 minutes so they begin to brown. Stir, then continue cooking for 5 to 7 more minutes until the potatoes start to become tender.
Add the onion and bell peppers. Cook for about 5 minutes, stirring often, until the vegetables soften.
Push the vegetables to one side of the skillet. Add the sausage to the empty side and press it gently into the bottom of the pan. Let cook for 1 minute, then stir the sausage into the vegetables and continue cooking for 1 to 2 more minutes until the sausage is browned and heated through. Season with salt and black pepper to taste.
Serve hot as a simple weeknight dinner or hearty breakfast option.
Notes
You can use leftover baked potatoes. I usually just switch to cooking the veggies first and then adding in the potatoes to heat and brown. There's really no wrong order on this though.My husband also likes to roast the potatoes in the oven at 400° and then adds them into the skillet at the end.