01 - Heat 1 tablespoon of oil in a large skillet over medium-high heat. Add diced potatoes and season with salt, pepper, and garlic powder. Cook, stirring frequently, until golden and crisp, approximately 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 all vegetables are 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 and lightly crisped at the edges.
04 - Heat 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 warm and pliable.
05 - Place a layer of crispy potatoes on each tortilla, top with warm corned beef, then add a generous spoonful of cabbage slaw. Finish with a drizzle of sour cream across the top.
06 - Arrange tacos on a serving platter and serve immediately with any remaining slaw on the side.