01 - Heat 1 tablespoon oil in a large skillet over medium-high heat. Add diced potatoes and season with salt, pepper, and garlic powder. Cook, stirring occasionally, until golden and crisp, about 12–15 minutes. Remove from skillet and set aside.
02 - In a mixing bowl, combine shredded cabbage, grated carrot, green onions, parsley, mayonnaise, Dijon mustard, apple cider vinegar, salt, and pepper. Toss thoroughly until evenly coated. Set aside to allow flavors to meld.
03 - Heat remaining oil in the same skillet. Add shredded corned beef and sauté for 2–3 minutes until heated through, stirring occasionally.
04 - Warm tortillas in a dry skillet over medium heat for 30 seconds per side or microwave in a damp paper towel for 20–30 seconds until soft and pliable.
05 - Layer each tortilla with crispy potatoes, top with warm corned beef, and add a generous spoonful of cabbage slaw. Finish with a drizzle of sour cream. Serve immediately with extra slaw on the side.