Preheat air fryer to 400 degrees. Add diced apples, brown sugar, 2 teaspoons ground cinnamon, cornstarch, and salt to a medium bowl and mix together. Set aside.
Grab one wonton wrapper and place on a clean counter in front of you, with a corner pointing towards you. Spread 1 tablespoon of cream cheese thinly over the egg roll wrapper, leaving the edges clean. Scoop ⅓ cup of diced apple and lay in a horizontal line through the center of the egg roll wrapper.
Fold over the bottom corner over the center and gently, yet tightly pull over the center. Fold over the right and left corners of the wonton wrapper over the middle so they meet in the center. Brush a little water on the edges to seal them. Brush water on the top corner and roll it around the egg roll to seal it closed. Repeat with other 7 egg roll wrappers.
Place 4 egg rolls in the air fryer once it's preheated. Spray with butter cooking spray and then air fry for 5 minutes. Flip the egg rolls and air fry for 5 more minutes. Remove from the air fryer and let cool for 5 minutes. Repeat with 4 remaining egg rolls.
Add 1/4 cup of granulated sugar to shallow, wide-rimmed bowl. Add remaining cinnamon and then stir together. Once the egg rolls have cooled for 5 minutes, spray with more butter cooking spray and then roll in cinnamon sugar. Serve with caramel sauce for dipping.