Preheat oven to 400°F and line a large sheet pan with parchment paper. Make sure the pan is large enough to hold chips in a single layer.

Heat olive oil in a pan over medium heat. Add cooked ground beef or chicken. Sprinkle taco seasoning and mix well. Cook for 2 to 3 minutes until heated through and evenly coated. Remove from heat.

Spread tortilla chips evenly across the prepared sheet pan. Keep them mostly in one layer so they stay crispy during baking.

Add the cooked meat over the chips using a spoon. Spread it out evenly so each chip gets some topping.

Sprinkle black beans and corn across the tray. Try to cover the chips evenly without piling too much in one spot.

Add sliced jalapeños over the nachos. Adjust the amount based on your spice preference.

Sprinkle shredded cheese over the entire tray. Make sure most chips have some cheese so everything melts together nicely.

Place the tray in the oven and bake for 8 to 10 minutes. Watch closely and remove once the cheese is fully melted and slightly bubbly.

Remove from oven and immediately add diced tomatoes and chopped green onions. Spoon sour cream and salsa on top or serve on the side.

Serve hot directly from the pan for best texture and flavor.