BEAT first 4 ingredients in large bowl with mixer until blended. Mix flour, dry gelatin mix and baking soda; gradually add to cream cheese mixture, mixing well after each addition. Refrigerate 30 min.
HEAT oven to 375ºF. Roll dough into 60 (1-inch) balls. Place, 2 inches apart, on baking sheets sprayed with cooking spray.
BAKE 9 to 11 min. or until edges are lightly browned. Cool on baking sheets 2 min. Remove to wire racks; cool completely.
SPRINKLE with powdered sugar just before serving.