Heat the oil in a medium skillet over medium heat until shimmering. Add the onion and cook until softened. Add the garlic, spices, and salt. Cook until fragrant. Add the ground beef and cook until done.
Heat oven to 400°, spread half of the chips in an even layer in a 9x13 baking dish. Sprinkle half of the beef mixture evenly over the chips and then sprinkle with 2 cups of the cheese. Repeat with the remaining chips, beef mixture, and cheese. Bake until the cheese is melted, about 9 minutes. Sprinkle with scallions and serve with guacamole, Salsa and sour cream.