Preheat the oven to 350 degrees Fahrenheit and line a large baking sheet with parchment paper.
Cook the chicken. Season chicken with taco seasoning, salt, and pepper, ensuring it’s fully coated. In a large skillet over medium heat, add oil and let it get hot. Add chicken (make sure not to overcrowd) and cook for 4-5 minutes. Flip and cook another 3-4 minutes until cooked through and no pink remains. Remove from the pan and set aside to cool for a couple of minutes. Slice into bite-size pieces.
While the chicken cooks, make your guacamole. Add avocado, lime juice, and salt and pepper to a medium bowl. Mash to combine until it reaches your desired consistency.
Assemble nachos. Add chips to your baking sheet, spreading them out evenly to cover the bottom. They can overlap some. Add diced chicken, spreading evenly over the chips. Next, add black beans, spreading out evenly. Finally, sprinkle shredded cheese over the chicken and beans.
Bake for 5-10 minutes until cheese is melted.
Finish assembling. Top nachos with shredded lettuce, diced tomatoes, guacamole, sour cream, and salsa. If your salsa is watery, you can place it in a small dish instead.
Enjoy! Add any more toppings you like and dig in!