Preheat your oven to 350°F (175°C).
Spread tortilla chips evenly on a large baking sheet.
Sprinkle the cooked ground meat over the chips.
Add the black beans evenly across the chips.
Generously top with shredded cheese.
Place in the oven and bake for about 10 minutes, or until the cheese is melted.
While the nachos bake, prepare fresh toppings: dice tomatoes and avocado.
Remove nachos from the oven and immediately add fresh toppings.
Drizzle with sour cream and sprinkle with cilantro.
Serve hot with guacamole and salsa on the side.