Place square wonton wrappers inside a damp paper towel to keep them pliable as you're folding them.
To fold the envelopes. place a wonton wrapper on a lined baking sheet so that it is oriented as a diamond instead of a square.
Fold the two side points to the middle, then fold up the bottom point to the middle, as shown above.
At this point, it's helpful to dip your index finger in water and press along the seams of the wonton envelope to seal it so no jam leaks out during frying.
Finally, fold the bottom point of the envelope under the flap, pressing to secure.
Allow the wonton envelopes to dry slightly before filling them. Open gently and spoon in a teaspoon of strawberry jam, at the most.
Seal the envelope by folding down the top flap. Again, it helps to run a wet finger around the top edge of the envelope to help the wonton wrapper dough stick together. Press to secure.
Heat vegetable oil over a medium-high burner and add the wonton envelopes, being careful not to crowd the pan. Fry until golden brown, then drain on paper towels.
Serve dusted with powdered sugar.
Notes
I definitely recommend folding the envelopes and then filling them with jam.I tried adding the jam to the wonton wrapper before folding, and it made it much harder to seal them. They were much more prone to leakage during frying.If the idea of filling the wonton envelopes is too much for you, don't fret. Just fold the wrappers into an envelope shape, fry, dust with powdered sugar and serve the jam on the side.