Preheat the oven to 400 F and line a baking sheet with parchment paper.
Preheat a large skillet and add the ground beef, onion, and season with salt and pepper. Crumble the ground beef until browned. Set aside.
Using the same pan, heat the avocado oil and saute the sweet potato for 8-10 minutes or until fork tender. Add the ground beef back to the pan and season with salt, pepper, garlic powder, oregano, fresh cilantro, and lime juice. Stir to combine.
Heat the tortillas for about 5-10 seconds to make them more pliable. Spoon about 2 spoonfuls of the beef and sweet potato mixture. Roll into a tight taquito and transfer to the baking sheet. Repeat with all of the tortillas. Spray with avocado oil spray.
Bake the taquitos in the preheated oven for 15 minutes or until crisp (see notes for air fryer instructions)
Serve warm topped with toppings of your choice.