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 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 edges.
04 - Warm flour tortillas in a dry skillet over medium heat for 15-20 seconds per side, or microwave in a damp paper towel for 20 seconds until soft and pliable.
05 - Layer each warm tortilla with crispy potatoes as the base, top with warmed corned beef, then add a generous portion of cabbage slaw. Drizzle with sour cream and serve immediately while warm.