Adjust oven rack to lowest position, and heat oven to 450 degrees.
Mix beans and 1/2 cup salsa in a medium bowl.
Place crust on a cookie sheet, then spread the bean mixture over crust.
Bake until it's crisp and warm, about 10 minutes.
Remove from oven; top with lettuce, green onions and dollop with the remaining salsa.
Drizzle (or, if dressing has an easy-pour top, squirt) dressing over pizza. Top with chips and cheese, then return to oven and bake until the cheese melts, about 2 minutes longer.