Preheat your oven to 400°F (200°C).
Line the baking sheet with parchment paper for easy cleanup (optional).
Spread the tortilla chips evenly across the baking sheet.
In a mixing bowl, combine the black beans, diced tomatoes, chili powder, ground cumin, and a pinch of salt.
Spread the black bean mixture evenly over the tortilla chips.
Sprinkle cheddar cheese generously over the top of the chips and beans.
Add sliced jalapeños on top of the cheese.
Bake in the preheated oven for about 10-15 minutes, or until the cheese is melted and bubbling.
Remove from the oven and let cool for a couple of minutes.
Top with diced avocado, sour cream, chopped cilantro, and sliced green onions just before serving.
Serve immediately to enjoy the nachos at their best!