The less time you bake it the more moist it will be. If you want it extra gooey, start checking it at 45 minutes. It should be releasing from the edges of the pan, barely springing back when you touch the middle and a toothpick will come out with a tiny coating of batter. Your oven times may vary though, so check it early rather than later.
Also, you can substitute the Hatch chilies with canned greed chilies, jalapenos, or any other spicy vegetable you prefer.