Melt butter in large saucepan. Add onions, garlic and oregano; sauté until onions are softened.
Add chicken and green chiles to saucepan; stir to combine.
Add broth to saucepan; bring to a simmer. Add Monterey Jack Cheese Sauce; stir until incorporated. Heat over medium-low heat, stirring occasionally, until hot. Stir in crushed tortilla chips to serve. Garnish as desired.