Heat oven to 400°F. In small bowl, mix cheese and green chiles.
Remove pie crusts from pouches; place flat on work surface. With 3 1/4-inch round cutter, cut 8 rounds from each pie crust.
Spoon cheese mixture evenly onto half of each dough round. Brush edge of crust rounds with beaten egg. Fold crust rounds in half; press edges with fork to seal. Place on ungreased cookie sheet. Brush tops with egg. Cut small slit in top of each.
Bake 12 to 16 minutes or until golden brown. Serve warm with salsa.