01 - Heat oven to 425°F. Line a large baking sheet with parchment paper.
02 - Peel and cut sweet potatoes into fries approximately 0.4 inch thick.
03 - In a large bowl, toss fries with olive oil, smoked paprika, garlic powder, salt, pepper, and cornstarch if using until coated evenly.
04 - Spread fries in a single layer on the baking sheet without overlapping to ensure crispness.
05 - Bake for 15 minutes, flip fries, then continue roasting for 12 to 15 minutes until golden and crispy along the edges.
06 - While fries cook, combine Greek yogurt or sour cream, mayonnaise, lemon juice, Dijon mustard, minced garlic, chopped herbs, salt, and pepper in a small bowl. Chill until serving.
07 - Serve fries hot with the chilled dip alongside.