Heat the olive oil and butter over medium-high heat in a large skillet. Add the potatoes and season with salt and pepper.
2 tablespoons extra virgin olive oil, 1 tablespoon unsalted butter, 1 pound potatoes, 1 teaspoon fine sea salt, ½ teaspoon freshly ground black pepper
Cook until browned on one side, 6 to 7 minutes. Turn the potatoes over and cook for another 4 to 5 minutes, or until golden brown. Remove the potatoes from the skillet with a slotted spoon.
If the skillet is looking dry, add another tablespoon of olive oil.
Add the kielbasa and cook for 2 to 3 minutes on each side, until lightly browned.
14 ounces kielbasa
Add the onions and pepper and cook, stirring frequently, until the onions are soft and translucent and the peppers and tender. Season with salt and pepper.
1 yellow onion, 1 to 2 bell peppers
Stir the potatoes back in and continue cooking for another minute or two. Check seasonings and serve.