In a large bowl, combine all the dry ingredients, flour, sugar; baking powder and salt, set aside.
In another bowl, whisk the wet ingredients; milk, melted butter, egg, vanilla extract.
Whisk wet and dry ingredients together, then the diced apple. Mix all together.
Fill and heat fryer or pot with oil and let heat over medium-high heat to about 350 degrees F. If you don't have a thermometer, scoop just a dollop size of the batter and add to the oil, if it floats immediately without turning brown, the oil is hot enough to fry.
Add about a 1/2 cup of water in a cup with a drizzle of oil, dip an ice cream scoop or your clean hand into the cup and scoop batter.
Fry in the hot oil and when it's brown enough flip to the other side and fry until golden brown.
Drain on a pan lined with paper towels.
Serve and sprinkle Confectioner sugar (if desired). Enjoy.
If you don't have cake flour here is the substitution;
1 cup of all-purpose flour plus 2 tablespoons of cornstarch.