1Set oven control to broil. Line cookie sheet with foil. Place chiles on cookie sheet. Broil with tops 4 to 5 inches from heat 8 minutes, turning after 6 minutes, until blackened and charred. Place in paper bag; seal tightly. Let stand 15 minutes. Peel and discard skins; discard seeds and stems. Chop chiles.
2Spray 3 1/2-quart slow cooker with cooking spray. In slow cooker, stir milk, cornmeal, flour, sugar, melted butter, baking powder, salt and eggs with whisk until blended. Stir in chiles, corn and cheese.
3Cover; cook on Low heat setting 2 hours 30 minutes or until set. Uncover; cook 15 minutes longer.