Preheat the oven to 450 degrees F.
Lightly grease a 15x10x1-inch baking pan or a 13x9-inch baking pan
In a bowl, whisk the flour, the parmesan cheese, and the baking powder together.
Cut in the cold butter into the flour mixture until the mixture resembles coarse crumbs.
Add the heavy whipping cream to the flour mixture and stir until moistened.
Crumble the crumble mixture into ½-1-inch pieces.
Bake on an upper oven rack until light golden brown, about 8-10 minutes.
Transfer the crumb topping from the oven and lower the oven temperature to 350 degrees F.
Step 9 -In a large bowl, mix the cream cheese and the sour cream until smooth.
Stir the cream of chicken soup, the enchilada sauce, the green chiles, and the chicken into the cream cheese mixture.
Transfer the chicken mixture to an 11x7-inch or 13x9-inch baking dish.
Sprinkle the chicken mixture with the Colby-Monterey Jack cheese and the baked crumb topping.
Place the filled baking dish on a baking sheet.
Bake, uncovered, on a lower oven rack until the topping is golden brown and the filling is bubbly about 35-40 minutes.
Sprinkle with the chopped green onions
Serve.