Place boneless skinless chicken breasts in a single layer in the bottom of a 4 quart or larger crockpot.
Open the can of Rotel and pour the entire contents including all the liquid directly over the chicken.
Open the taco seasoning packet and sprinkle it evenly over the top of the chicken and Rotel.
Place the lid on the crockpot.
Cook on HIGH for 3 to 4 hours or LOW for 6 to 8 hours.
Check the internal temperature of the chicken with a meat thermometer. It must read 165 degrees before you proceed.
Use tongs to transfer the cooked chicken to a large deep bowl.
Let the chicken rest for 2 to 3 minutes so it is cool enough to handle.
Place a hand mixer in the bowl on low speed and run it for 30 seconds until the chicken is fully shredded. Alternatively use two forks to pull the chicken apart into thin strips.
Pour the shredded chicken into a fine mesh strainer and let the excess liquid drain out for about one minute.
Pat the chicken lightly with paper towels to remove any remaining moisture. Dry chicken means crispy nachos.
Preheat your oven to 350 degrees and let it fully come to temperature before you assemble the nachos.
Tear off a sheet of parchment paper large enough to cover your baking sheet completely and lay it flat on the pan.
Pour the tortilla chips onto the parchment lined baking sheet.
Spread the chips out in an even layer across the entire surface of the pan. Aim for one to two layers deep maximum.
Make sure there are no large empty gaps on the pan where chips are missing.
Use a spoon or your hands to scatter the drained shredded chicken evenly across all the chips. Every chip should have a shot at getting some chicken on it.
Open your block of cheddar cheese and shred it using a box grater into a bowl.
Sprinkle the shredded cheddar evenly over the chicken and chips making sure to cover as much surface area as possible.
If you are adding any hot toppings that you want baked in add them now. Sliced jalapenos drained corn black olives and diced red onion all work great here.
Open the oven door and carefully slide the baking sheet onto the center rack.
Set a timer for 15 minutes.
Check the nachos at the 15 minute mark. The cheese should be fully melted and starting to bubble at the edges. The chips around the perimeter should be extra golden and crispy.
If the cheese is not fully melted return the pan to the oven for 2 to 3 more minutes and check again.
Use oven mitts to carefully remove the baking sheet from the oven and set it on a heat safe surface.
Immediately dollop sour cream around the pan in small spoonfuls.
Add guacamole in small dollops between the sour cream.
Spoon salsa over the top in whatever amount your family likes.
Scatter sliced green onions across the entire pan.
Add fresh cilantro leaves if your family enjoys them.
Add any other cold toppings you like such as pico de gallo hot sauce or extra jalapenos.
Set the baking sheet in the center of the table with a spatula for serving.
Give everyone a side plate and let them scoop their own portion directly from the pan.