HEAT oven to 375°F.
MIX flour, baking soda and salt. Microwave chocolate and margarine in large microwaveable bowl on HIGH 2 min. or until margarine is melted; stir until chocolate is completely melted. Add cream cheese; beat with mixer until well blended. Beat in egg and vanilla. Gradually add flour mixture, beating after each addition until well blended.
SHAPE dough into 1-inch balls; roll in sugar until evenly coated. Place, 2 inches apart, on baking sheets. Press your thumb into center of each ball; fill each indentation with about 1/4 tsp. preserves.
BAKE 8 to 10 min. or until lightly browned. Cool 1 min. on baking sheets; remove to wire racks. Cool completely.
