Add chicken, salsa, chicken stock, chili powder and cumin to a 6-qt Instant Pot® and gently toss to combine; season with salt and pepper, to taste.
Select manual setting; adjust pressure to high, and set time for 10 minutes. When finished cooking, quick-release pressure according to manufacturer’s directions.
Remove chicken from the Instant Pot® and shred using two forks; season with salt and pepper, to taste, if needed.
Preheat oven to 400 degrees F. Lightly oil a baking sheet or coat with nonstick spray.
Place tortilla chips in a single layer onto the prepared baking sheet. Top with cheese and 2 cups shredded chicken (reserve remaining chicken for later use).
Place into oven and bake until heated through and the cheese has melted, about 10-12 minutes.
Serve immediately, topped with guacamole, pico de gallo, sour cream and cilantro.
Notes
Use dark meat, white meat, or both. Depending on personal preference, you can use a mix of both chicken thighs and breasts, or substitute all thighs or all breasts.
Use a good quality sheet pan. A durable sheet pan is ideal – it will last for years with minimal wear and tear, and will help achieve even cooking and avoid warping at high temperatures.
Use thick, sturdy tortilla chips. Thick tortilla chips will prevent sogginess, support heavy loads without snapping or breaking, and withstand oven heat very well.
Freshly grated cheese goes a long way. Pre-packaged shredded cheese contains anti-caking agents that can hinder its ability to melt properly.
Create a cheese barrier. Sprinkle the shredded cheese over the tortilla chips first before adding the meat, blocking the moisture from wet toppings (ex. chicken, beans, salsa, and sour cream) to prevent the chips from becoming soggy.
Add cold toppings last. Always add cold, fresh toppings after the nachos have been baked.