Heat oven to 350 degrees F. Line a sheet pan with parchment paper if you have it.
Cut the potatoes into pieces about 3/4-inch in size (approximate). Toss the cut potatoes in the oil, 1 1/2 teaspoons of salt, smoked paprika and cayenne pepper.
Spread the potatoes evenly on the sheet pan. Roast for about 15 minutes at 350 degrees.
Remove the potatoes from the oven. Increase the oven temperature to 450 degrees F. Toss the potatoes and roast for about 20 - 25 minutes more, stirring the potatoes again about halfway through to brown the potatoes on all sides.
While the potatoes are roasting, mix together the sour cream, parsley, red onion, lemon juice, honey, garlic, and remaining 1/2 teaspoon of salt.