Preheat oven to 400°.
Lightly spoon flour into a dry measuring cup; level with a knife.
Combine flour and next 5 ingredients in a bowl. Combine buttermilk, butter, and eggs. Stir into flour mixture. Fold in corn and pepper. Spread into a 9-inch square baking pan coated with cooking spray. Bake at 400° for 23 minutes or until golden brown.