01 - Preheat your oven to 425°F (220°C). Line a large baking sheet with parchment paper for easy cleanup.
02 - In a bowl, toss the frozen fries with olive oil, smoked paprika, garlic powder, onion powder, and salt until evenly coated. Spread the seasoned fries in a single layer on the prepared baking sheet. Bake according to package instructions, or until they are golden brown and crisp, approximately 25–30 minutes. Turn the fries halfway through the baking process for even cooking.
03 - While the fries are baking, heat a large skillet over medium heat. Add the ground beef and cook, breaking it up with a spoon, until it is thoroughly browned, about 5 minutes. Drain away any excess fat.
04 - Add the finely chopped onion and minced garlic to the skillet with the browned beef. Sauté for 2–3 minutes until the onions have softened and become translucent.
05 - Stir in the taco seasoning, salt, black pepper, tomato paste, and water. Bring the mixture to a simmer and cook for 3–4 minutes, allowing it to thicken.
06 - Once the fries are crisp, carefully transfer them to an ovenproof serving dish. Evenly spoon the prepared taco beef mixture over the fries, followed by a generous sprinkle of both cheddar and Monterey Jack cheeses.
07 - Return the assembled dish to the preheated oven for 5–7 minutes, or until the cheese is completely melted and bubbling.
08 - Remove the dish from the oven. Scatter the diced tomato, finely diced red onion, and jalapeño slices (if using) over the top. Dollop with sour cream and guacamole, then finish with a sprinkle of fresh chopped cilantro.
09 - Serve these loaded nacho fries immediately to best enjoy their crispness and warmth.