Combine all ingredients except for oil in a food processor. Pulse until well-combined. Add in olive oil and pulse until smooth and desired consistency has been reached.
Soak the fries in cool water for at least a half an hour. Meanwhile, preheat the oven to 425.
Thoroughly dry sweet potatoes and toss them with the cornstarch. Remove excess cornstarch and toss potatoes with 1 tbsp olive oil, garlic powder, and paprika. Bake for 35 minutes, stirring halfway. Once they are out of the oven, sprinkle with salt.
Meanwhile, heat 1 tbsp olive oil in a skillet over a medium heat. Add cauliflower and cook until golden. Season with salt and pepper and let drain on paper towel.
Top fries with chimichurri, cauliflower, and sun-dried tomatoes. Enjoy immediately.