Combine 1 cup oats, peanut butter and confectioners' sugar until well blended. Shape dough into 1-1/4-in. balls; flatten into 1/4-in.- thick circles. Place 1/2 teaspoon of jam in center of circle; wrap peanut butter dough around jam. Pinch edges to seal; shape into ball. Repeat with remaining jam and dough. Roll balls in remaining oats.