Preheat oven to 375°.
Combine softened butter and sugar in a large bowl. Beat with a mixer at medium speed until light and fluffy. Add egg substitute, nonfat buttermilk, and eggs, beating at low speed until well combined.
Lightly spoon flour into dry measuring cups, and level with a knife. Combine flour, cornmeal, baking soda, baking powder, and 3/4 teaspoon salt in a medium bowl, and stir with a whisk. Add flour mixture to buttermilk mixture, stirring just until combined. Fold in shredded cheese, corn, and green chiles. Pour batter into a 13 x 9-inch baking pan coated with cooking spray. Bake at 375° for 45 minutes or until a wooden pick inserted in center comes out clean. Remove from oven, and cool for 5 minutes in pan.