Place a layer of tortilla chips over a cookie sheet.
Sprinkle with both kinds of cheeses.
Top with chopped green onions and bacon.
Pop in the oven to melt under the broiler. Watch it carefully since it can go fast. A minute or two is sometimes enough depending on how hot your broiler is. If you wanted to do personal sizes you could melt them in the microwave but for parties I think a big sheet pan is more fun and way faster.