Preheat your skillet over medium heat.
Add olive oil and allow it to heat.
Slice the Italian sausage into thick rounds.
Add the sausage slices to the pan and cook until browned.
Slice the bell peppers and onion into strips.
Add the sliced peppers and onions to the skillet.
Stir occasionally, cooking until vegetables are tender.
Add minced garlic, salt, and pepper, and cook for an additional 2 minutes.
Garnish with fresh parsley before serving.