Combine the first 5 ingredients; stir well. Add corn, jalapeño, and onions; stir. Combine milk, honey, oil, and egg whites; stir. Add to flour mixture, stirring just until the dry ingredients are moistened. Spoon batter into a 9-inch pie plate coated with cooking spray.
Bake at 375° for 25 minutes or until a wooden pick inserted in center comes out clean. Remove from pie plate; cut into wedges. Serve warm.