Heat the olive oil in a large skillet over medium heat.
Add the sliced kielbasa to the skillet and cook for about 5-7 minutes, stirring occasionally, until browned.
Remove the kielbasa from the skillet and set aside. In the same skillet, add the onions and bell peppers.
Sauté the vegetables for about 5-7 minutes, until they are tender and slightly caramelized.
Add the minced garlic and smoked paprika. Stir for about 1 minute until the garlic is fragrant.
Return the kielbasa to the skillet. Season with salt and pepper, and mix everything together.
Cook for an additional 5 minutes until everything is heated through.
Garnish with fresh parsley before serving.
Consider adjusting the vegetables according to your preference, like adding zucchini or mushrooms, if desired.
For added heat, consider adding a pinch of red pepper flakes during cooking.