Cook sausage in skillet until brown. Drain and transfer to large mixing bowl. Heat oil in skillet and cook hashbrowns until browned, seasoning with chili powder, cayenne pepper, salt and pepper. Combine with sausage, 1/2 c cheese and diced green chiles.
Spray 13x9" pan with cooking spray. Pour a small amount of enchilada sauce into the pan.
Pour remaining sauce into a pie plate. Dip each tortilla into enchilada sauce, divide the sausage/hash brown mixture between the tortillas, roll tightly and place in pan. Pour remaining sauce over enchiladas and top with remaining cheese.
May cover tightly with foil and refrigerate at this point. If baking immediately, cover with foil and bake at 375 for 20 minutes, remove foil and bake for another 10 minutes or till slightly browned.
If baking after refrigerated, remove from refrigerator 10-15 minutes before baking. Bake for 30 minutes covered, remove cover and bake for 10 minutes or till slightly browned.