Preheat oven to 450 degrees F. Place your rimmed baking sheet in the oven while it preheats.
Combine arrowroot powder with smoked paprika, garlic powder, and onion powder.
Toss the squash in a bowl with arrowroot powder and spice mixture.
Drizzle the olive oil over butternut and toss to distribute.
Lightly spray the hot baking sheet with olive or avocado oil.
Add the butternut squash pieces on the (hot) baking sheet and make sure to give them all plenty of space. Spray the top of the butternut squash with olive or avocado oil cooking spray.
Reduce the oven temp to 425 degrees F and bake the fries for 15 minutes. Flip and then bake another 5-10 minutes.
Sprinkle with parsley and salt to taste.
Preheating your oven and baking sheet is a crucial step in this recipe. A nice hot oven helps the cooking process start immediately and produces a crispier fry.Don't crowd your pan! If the butternut squash is too close together, it will steam instead of bake/roast. Use two baking sheets if you want to double the recipe.