Preheat oven to 375 degrees F. Butter a shallow 1-quart baking dish and set aside.
In a medium mixing bowl, toss together the chilies, spinach, pepper jack and Parmesan cheeses. In another bowl, stir together the remaining ingredients and then fold into the chile and cheese mixture until well combined.
Transfer to a prepared baking dish and bake for 20 to 30 minutes, or until bubbling and starting to brown. If the dip is bubbling and not browning, place under the broiler for a couple minutes.