Preheat oven to 425°.
Combine first 7 ingredients in a large bowl, stirring well. Combine buttermilk, butter, chiles, and egg in a medium bowl, stirring with a whisk. Add buttermilk mixture to flour mixture; stir just until moist. Fold in bacon. Pour batter into an 8-inch square baking pan coated with cooking spray.
Bake at 425° for 18 minutes or until a wooden pick inserted in center comes out clean. Cool 10 minutes in pan on a wire rack.