In a large bowl, stir together corn, green onions, egg yolk, and milk.
Combine flour, baking powder, salt, and red pepper flakes in a small bowl. Stir into corn mixture.
Using a rubber spatula, fold egg whites into corn mixture until evenly mixed in.
Heat about 1-2 inches of Vegetable oil to 375 degrees in a cast iron pan or Dutch oven (or you can use a heavy-bottomed skillet).
Drop batter by spoonfuls into hot oil and fry until golden brown, about 4 minutes, flipping over halfway through cooking time. Place on a paper towel-lined plate to drain. Serve immediately.