Fill a deep, heavy-duty pot with about 3 inches of vegetable oil. Put the pot on low and begin heating the oil to 350F. It takes 15-20 minutes for the oil to come to temperature on my cooktop, which is plenty of time to make the apple fritter batter. Remember to check the oil temperature a few times while you are making the batter.
In a large bowl, whisk together the flour, sugar, baking powder, baking soda, salt, and spices. In a medium bowl, mix the buttermilk, eggs, butter, and vanilla until well blended. Pour the wet ingredients into the dry ingredients, add the apples, and, using a large spoon or a spatula, mix it all together in a few swift strokes.
Once the batter is ready, set up your work area. Put out a paper towel lined plate or baking sheet next to the frying pot. Mix together the cinnamon sugar ingredients in a wide bowl so you can roll the fritters around in it. And put out a baking sheet with a cooling rack over it for the finished fritters.
Check the oil temperature. Once it's at 350F, begin making the fritters. Using a spoon or a cookie scoop, carefully drop tablespoon amounts of batter into the hot oil. Don't overcrowd the oil or it will get too cool. My pot is 10 inches wide and quite deep. I put 7-8 into the pot each batch. Fry the fritters for 3 minutes, turning occasionally, or until brown all over.
Scoop out the fritters using a slotted spoon or wire skimmer, letting them drain for a moment before moving them to the towel lined plate. Add the next batch of fritters to the oil. While they are cooking, roll the finished fritters in the cinnamon sugar and put them on the cooling rack.
You can serve them as is or you can pair them with
Creamy, Knock Your Socks Off, Apple Cider Dip.