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 crispy, 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 1 tablespoon 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 30 seconds per side or microwave in damp paper towels for 20 seconds until soft and pliable.
05 - Build each taco by layering crispy potatoes on the tortilla base, followed by warm corned beef. Top generously with cabbage slaw and finish with a drizzle of sour cream.
06 - Serve immediately while potatoes remain crispy. Offer extra slaw on the side for guests who prefer additional crunch.