• Line a baking sheet or large plate with paper towel and set aside.
• Pour the oil into a deep pot and place over medium heat with a thermometer. Heat the oil until it reaches 360 F.

Prepare the Apples

• Peel all the apples.
• Slice the apples crosswise into 1/2" slices. You should get 4-5 slices from each apple.
• Cut out the core of each slice.
• Combine the sugar and cinnamon in a medium bowl to make the cinnamon sugar and set aside.

Make the Batter

• While the oil heats up, make the batter. However, don't make the batter until just before you're ready to fry.
• In a medium bowl, whisk the milk, eggs, and vanilla together. 
• Add in the flour and baking powder and whisk. While you whisk, slowly pour in the melted butter and whisk until smooth - you don't want any lumps in the batter.

Fry the Apple Rings

• Once the oil is hot, use a fork to individually dunk each apple slice into the batter. Carefully use a fork or tongs to lower the apples into the hot oil.
• Place no more than four batter coated apple slices into the pan at a time. Cook for 4 minutes on one side and then flip them and fry for another 3 minutes until golden brown.
• Once finished, place the fried apple rings onto a paper towel lined plate or baking sheet.
• Allow the excess oil to absorb into the paper towel and then roll in the bowl of cinnamon sugar until fully coated.
• Serve immediately, optionally with vanilla ice cream!
• Before frying the next batch, allow the oil to reheat to between 350 F and 360 F.