Preheat the oven to 400°F (200°C). Lightly grease a large rimmed baking sheet.
Heat the olive oil in a skillet over medium heat. Add the ground beef and cook for 7–10 minutes, breaking it up as it browns. Drain excess fat, then stir in the Mexican seasoning.
2 tablespoons olive oil, 1 pound lean ground beef, 2 tablespoons Mexican seasoning
Spread the tortilla chips in an even layer on the prepared baking sheet. Top evenly with the seasoned beef, black beans, and shredded cheese.
12 ounces tortilla chips, 1 cup black beans, 2 cups cheddar cheese
Bake for 6–8 minutes, or until the cheese is melted and the nachos are heated through.
While the nachos bake, prepare the guacamole. Mash the avocados with lime juice until smooth. Stir in the red onion, garlic powder, and salt.
2 medium avocados, ½ lime juice, ¼ cup red onion, ½ teaspoon garlic powder, ½ teaspoon salt
Remove the nachos from the oven and top with guacamole, jalapeño slices, sour cream, salsa, and cilantro.
1 jalapeño, ½ cup sour cream, ⅓ cup fresh salsa, ¼ cup fresh cilantro
Serve immediately and enjoy.