Heat olive oil in a large skillet over medium-high heat.
Add sliced kielbasa sausage and sauté for 5–7 minutes, until browned.
Add the sliced onions and bell peppers to the skillet.
Sprinkle with smoked paprika, salt, and pepper.
Cook, stirring occasionally, for 10–12 minutes, or until vegetables are tender and slightly caramelized.
Remove from heat. Garnish with fresh parsley if desired.
Serve hot with potatoes, rice, or crusty bread.