Brown beef and onion in a deep 12-inch 5-quart saute pan over medium-high heat for 8 minutes, breaking up the meat and cooking to 160°F. Drain excess fat.
Stir in cumin, oregano and garlic powder for 30 seconds. Add salsa verde, pinto beans, fusilli, broth and salt and bring to a simmer.
Cook uncovered over medium-low heat for 12 to 15 minutes, stirring every 2 minutes until pasta is tender; add reserved water in small amounts if the sauce dries too early.
Remove from heat and fold in Monterey Jack until melted. Rest for 2 minutes so the sauce settles around the pasta.
Divide between bowls and scatter the measured crushed chips over the portions immediately before eating.