Coat a waffle iron with cooking spray, and preheat.
Lightly spoon the flour into dry measuring cups, and level with a knife. Combine flour and next 4 ingredients (flour through salt) in a large bowl. Place buttermilk, oil, and egg in a medium bowl; stir well with a whisk. Add buttermilk mixture to flour mixture; stir until smooth. Fold in jalapeño and corn.
Spoon about 1/2 cup batter onto hot waffle iron, spreading batter to edges. Cook 3 to 5 minutes or until done; repeat procedure with remaining batter. Cut each waffle into 4 pieces.