In a small skillet, brown the chorizo over medium heat, making sure to crumble the meat as it browns. Drain, and set aside.
Line a large sheet pan with parchment paper and arrange half of the chips in a single layer on the pan.
Add ½ of the chorizo, ½ of the cheese, the red onions, and jalapenos (if using) on top of the chips.
Add the second layer of chips, and repeat with the chorizo, cheese red onion, and jalapeno layers.
Place the sheet pan in the oven and bake for 6-7 minutes at 380℉, or until the cheese is fully melted and the onion and jalapenos have softened slightly.
Remove the sheet pan from the oven and top with the tomatoes, scallions, bell pepper, and cilantro.
Serve and top with sour cream and salsa if desired.
Keyword chorizo, mexican, nachos, sheet pan dinner