Prepare the Sweet Potatoes: Peel and cut sweet potatoes into ⅓ to ½-inch thick matchsticks.
1 ½ pound sweet potatoes
Place the matchsticks into a bowl and cover with cold water. Soak for at least 30 minutes.
Meanwhile, preheat the oven to 425 degrees Fahrenheit. Line a sheet pan with parchment paper and set aside.
Mix up cornstarch, garlic powder, black pepper, and smoked paprika.
2 teaspoons cornstarch, ½ teaspoon garlic powder, ½ teaspoon black pepper, ¼ teaspoon smoked paprika
Drain and rinse sweet potatoes to remove excess starch. Thoroughly pat sweet potatoes dry then toss with avocado oil and cornstarch mix until evenly coated.
2 tablespoons avocado oil
Bake the Fries: Spread sweet potatoes out on prepared sheet pan, leaving at least half an inch between each fry. If necessary, bake in batches or on separate pans to provide enough space.
Place pan on top oven rack and bake for 10-12 minutes then flip the fries and return to oven for 8-10 more minutes.
Finish and Serve: While the fries bake, prepare the garlic herb butter: Stir together the melted butter, parsley, garlic, and sea salt. Set aside.
¼ cup unsalted butter, ¼ cup parsley, 4 cloves garlic, 1 teaspoon sea salt
Remove pan from oven and allow fries to rest for about 5 minutes then toss in the garlic herb butter and again in grated parmesan. Serve warm.
⅓ cup parmesan cheese