Cut 4 ounce block of cream cheese in half, then in half again to create 4 pieces. Further cut each piece in half again so you have 8 equal pieces total. Set aside.
Working with 6 wonton wrappers at a time, separate them out onto a clean work surface. Divide one of the cream cheese pieces into 6 pieces and place a piece in the middle of each wonton wrapper.
Place 1 teaspoon of blueberry pie filling over the top of the cream cheese.
Use your finger to lightly wet the 4 edges of each wonton wrapper.
Gently fold in half diagonally to make a triangle, then bring up the remaining two corners so all corners join together.
Press seams together to ensure a tight seal.
Set wontons aside, covered in a damp paper towel, while you finish making the remaining wontons.
Preheat the air fryer to 325 degrees F (160 degrees C).
Spray the inner basket with cooking spray and place as many wontons in basket as will fit, without overcrowding. Lightly mist wontons with cooking spray.
Air-fry for 5 minutes. Remove to a cooling rack and dust with powdered sugar. Let cool while you cook the remaining wontons in batches. Best served slightly warm or at room temperature.