Preheat oven to 350 degrees F.
To make shredded chicken: spray the bottom of your instant pot* insert with cooking spray.
Add chicken to instant pot, sprinkle with salt and pepper, and add 1/4 cup of water or chicken broth to the bottom. Seal cover, make sure vent spout is closed, and cook on high pressure for 15-17 minutes. Allow to depressurize for 5 minutes before releasing valve. Use two forks to shred chicken (or add to stand mixer with paddle attachment and shred that way.)
Cover the bottom of a large baking sheet wiht tortilla chips. You want them close together, but not overlapping.
Top with shredded chicken and black beans, then cover generously with shredded cheese. Bake for 10-15 minutes or until cheese is melted and bubbly.
Remove from oven and top with avocado slices, tomatoes, cilantro, and jalapeno slices, then drizzle with sour cream and hot sauce, if desired. Serve immediately!