Spread the tortilla chips in an even layer on a large baking sheet or a sturdy oven-safe platter.
In a skillet set over medium heat, combine the rinsed black beans, corn kernels, ground cumin, and chili powder. Season with salt and pepper, and cook for about 3-4 minutes until warmed through.
Sprinkle half of the shredded cheddar cheese evenly over the tortilla chips.
Spoon the black bean and corn mixture evenly over the cheesy chips.
Distribute the slices of jalapeño on top of the nachos, followed by the remaining cheddar cheese.
Place the assembled nachos in the preheated oven and bake for 10-12 minutes, or until the cheese is fully melted.
Remove the nachos from the oven and top with diced avocado, salsa, and sour cream.
Scatter chopped green onions and fresh cilantro over the top for garnish.
Notes
Serve on a rustic wooden board or vibrant platter. Garnish individual servings with extra jalapeño slices and cilantro.