For the nachos:
1 16-ounce bag tortilla chips
1 8-ounce block cheddar cheese, shredded, or 1 8-ounce bag of pre-shredded cheddar cheese
1 8-ounce block Monterey Jack cheese, shredded, or 1 8-ounce bag of pre-shredded Monterey Jack cheese
For the toppings (all optional; feel free to add your own favorites):
1 15-ounce can black beans, drained
Leftover grilled chicken or rotisserie chicken
Pico de gallo
Guacamole
Sliced black olives
Pickled jalapeños
Sour cream or lime crema (see below)
Lime wedges
Preheat a gas or charcoal grill to medium direct heat (350°F to 400°F).
Divide the tortilla chips between 4 cast iron platters or skillets, or make 4 foil "plates" by tearing off large pieces of foil and crimping the edges.
Top each mound of tortilla chips with about 1/2 cup (2 ounces) cheddar and 1/2 cup Monterey Jack cheese. If you'll be adding black beans and/or chicken to your nachos, do this now so they heat up on the grill.
Place the cheese-covered chips on the grill and lower the grill lid. Cook for 5 to 8 minutes, checking about halfway through to check the melting progress of the cheese.
Remove from the grill and either carefully transfer to a platter (watch out for sizzling-hot cast iron, if you're using it!), or serve the nachos straight from the skillet or foil. Top with spoonfuls of your favorite add-ons, like pico de gallo and guacamole, and eat immediately. Don't forget the napkins!