Cream together cream cheese, crab, soy sauce, and garlic powder.
Place a scant Tablespoonful of filling onto the center of each wonton wrapper.
Brush egg yolk on the edges of the wrappers, fold over in a triangle shape, and seal edges.
Place filled rangoons in a single layer on a baking sheet lined with waxed paper.
Freeze rangoons completely (takes approx. 1 hour).
Deep-fry rangoons in 375 degree oil, turning once, until golden brown.
Drain on cooling racks.