Peel and dice the potatoes into small cubes, about 1/2 inch in size.
In a bowl, toss the potato cubes with vegetable oil, salt, garlic powder, and onion powder.
Spread the seasoned potatoes on a baking sheet and bake at 425°F for 20-25 minutes, or until golden and crispy.
While the potatoes are baking, brown the ground beef in a skillet over medium heat.
Add the taco seasoning to the beef according to package instructions and simmer for 5 minutes.
Warm the nacho cheese sauce in a microwave-safe bowl.
To assemble, lay out a tortilla and spread some nacho cheese sauce in the center.
Add a portion of the seasoned beef, crispy potatoes, and a dollop of sour cream.