Cheese is the topping of greatest quantity in loaded nachos, according to Wikipedia.
Loaded nachos are built around tortilla chips covered with substantial layers of toppings, and cheese is usually the most abundant one. Shredded cheese or prepared nacho cheese is spread across the platter so it can melt and bind the chips, meat, beans, and other ingredients together. Common additions include salsa, guacamole, sour cream, jalapeños, olives, lettuce, tomatoes, and refried beans.
The cheese is typically melted before the cold toppings are added. A platter may go under a broiler or into a microwave, after which ingredients such as lettuce, salsa, tomatoes, and jalapeños are placed on top. This timing helps preserve the contrast between hot, stretchy cheese and crisp or cool garnishes.
“Loaded” does not describe one fixed recipe, so the exact proportions can differ. Cheese remains the defining heavy layer, while lettuce and salsa are usually finishing toppings rather than the bulk of the dish. The original 1943 nachos were much simpler: fried tortilla pieces, melted Colby cheese, and sliced pickled jalapeños.