01 - Combine sirloin cubes with olive oil, salt, black pepper, and smoked paprika in a mixing bowl. Toss thoroughly and allow to marinate while preparing other components.
02 - Heat olive oil in a large skillet over medium-high flame. Add potatoes, season with salt and black pepper, and sauté, stirring occasionally, until golden and fork-tender, approximately 12 to 15 minutes. Transfer potatoes to a plate and cover loosely to keep warm.
03 - Increase skillet heat to high. Arrange steak bites in an even layer (work in batches to avoid overcrowding). Sear without moving for 2 minutes, then turn bites and continue cooking 2 to 3 minutes longer until caramelized and desired doneness is achieved. Remove steak bites and set aside.
04 - Reduce skillet heat to medium. Add unsalted butter, allowing it to melt. Stir in minced garlic and dried thyme, sautéing 30 seconds until aromatic.
05 - Return potatoes and steak bites to skillet. Gently toss with the garlic butter until evenly coated and heated through, about 1 to 2 minutes.
06 - Sprinkle chopped fresh parsley over the dish and serve immediately.