Step 1: Preheat your oven to 425°F (220°C). Line two large baking sheets with parchment paper.
Step 2: Scrub sweet potatoes clean. Peel if desired. Trim the ends.
Step 3: Cut sweet potatoes into uniform sticks, about 1/4 to 1/2 inch thick.
Step 4: Place cut sweet potato sticks into a large bowl and submerge in cold water. Let soak for at least 30 minutes.
Step 5: Drain the sweet potatoes thoroughly. Lay them out on clean kitchen towels or paper towels and pat them completely dry.
Step 6: Return the dried sweet potato sticks to the large, dry bowl. Drizzle with avocado oil, ensuring each fry is lightly coated.
Step 7: Sprinkle the cornstarch over the oiled fries. Toss well until evenly distributed.
Step 8: Add the paprika, garlic powder, onion powder, salt, and pepper. Toss again until all seasonings are evenly distributed.
Step 9: Arrange the seasoned sweet potato fries in a single layer on the prepared baking sheets. Do not overcrowd the pans; use two if necessary.
Step 10: Bake for 15 minutes.
Step 11: Flip the fries using a spatula. Return to the oven and bake for another 10-15 minutes, or until deeply golden brown and crispy. Watch carefully to prevent burning.
Step 12: Remove from the oven and serve immediately.