Preheat the oven to 180℃.
Line a baking tray with some parchment paper. Makes cleaning the tray later on much easier. I used a 10"X12" tray.
If you are using frozen sweet corn, then cook it before using it for the nachos. Steam, boil or microwave it.
Arrange the tortilla chips in the lined tray. Make sure they overlap a bit. Don't leave huge spaces in between.
Scatter half quantity of the beans and sweet corn over the chips.
Scatter ½ quantity of both the shredded or grated cheeses.
Scatter the remaining beans and corn.
Top with the remaining cheeses.
Bake the nachos for 10 minutes to allow the cheeses to melt a bit.
Take the tray out of the oven.
Spread the salsa roja over the melted cheese.
Return the tray back in the oven and bake for the remaining 5 minutes.
Take the tray out and scatter the chopped avocado, cilantro and spring onion.
Scatter the pico de gallo.
Dot the baked nachos with blobs of sour cream.
Serve immediately.