Preheat your oven to 400°F (200°C).
Spread the tortilla chips evenly on a large sheet pan.
Layer half of the cheese over the chips.
Add the cooked ground beef or shredded chicken evenly on top.
Spread the black beans over the meat.
Top with the remaining cheese.
Add diced tomatoes and jalapeños on top of the cheese.
Bake in the preheated oven for about 10 minutes, or until cheese is bubbly.
Remove from the oven and top with sliced avocado and cilantro.
Serve immediately with sour cream and salsa on the side.