01 - Set a large skillet over medium-high heat and add the butter, allowing it to melt completely and coat the bottom of the pan.
02 - Add the sliced kielbasa in a single layer and cook for about 4 minutes, turning once, until nicely browned on both sides. Transfer the sausage to a plate and set aside.
03 - In the same skillet, add the chopped onion and sliced potatoes. Cook for 6 to 8 minutes, stirring occasionally, until the potatoes begin to soften and develop light golden edges.
04 - Stir in the minced garlic, diced bell pepper, and broccoli florets. Sauté for 3 to 4 minutes until the garlic is fragrant and the vegetables start to become tender.
05 - Return the browned kielbasa to the skillet. Sprinkle with smoked paprika, dried oregano, salt, and black pepper. Toss everything together until evenly coated.
06 - Reduce heat to low and sprinkle the shredded cheddar cheese evenly across the top of the mixture. Cover the skillet with a lid and cook for 3 to 5 minutes, until the cheese is fully melted and the potatoes are fork-tender.
07 - Remove from heat, scatter fresh chopped parsley over the top if desired, and serve immediately while hot.