Add the ground beef and onion to a skillet over medium high heat. Saute until the meat is browned and the onions have softened. Drain any excess grease.
Reduce the heat to medium, and stir in the garlic, chili powder, cumin, paprika, oregano and salt and pepper to taste. Stir to combine, and saute for another minute.
Pour in the diced tomatoes and chopped roma tomato, cover and simmer for 15 minutes.
Place the tortilla pieces into an air fryer basket, and spray with cooking spray.
Cook at 400 degrees until the chips are browned and crispy.
Place the chips onto a plate or platter, and top with the chili mixture.
Sprinkle on the cheese and allow it to melt.
Garnish with green onions before serving if desired.