Set up your station. Place a wonton wrapper on a clean, dry, flat surface. Cover the remaining wrappers with a damp paper towel so they don't dry out while you work.
Add the filling. Spoon 1 to 2 teaspoons of raspberry pie filling into the center of the wrapper. Do not overfill — overstuffed wontons burst open during cooking.
Wet the edges. Dip your finger or a small pastry brush in water and trace all four edges of the wrapper. The starch in the wrapper will activate and create a tight seal.
Fold and seal. Fold the wrapper in half diagonally to form a triangle, pressing all edges firmly to seal. For a fancier "purse" shape, bring all four corners up to meet in the center and pinch closed.
Repeat. Continue with the remaining wrappers and filling until you have 12 sealed wontons.
Prep the air fryer. Lightly spray the air fryer basket with cooking spray. Arrange the wontons in a single layer, leaving at least 1/2 inch of space between each for proper air circulation. Lightly spray the tops of the wontons with cooking spray.
Air fry. Cook at 340°F (170°C) for 3 to 5 minutes, flipping halfway through, until the wrappers are golden brown and crispy.
Cool briefly. Let the wontons rest in the basket for 1 to 2 minutes — the raspberry filling will be very hot straight out of the air fryer.
Dust and serve. Transfer to a serving plate and dust generously with powdered sugar using a fine-mesh sieve. Serve immediately for maximum crispness.