In large bowl, mix cream
cheese, sugar, and margarine until well blended. Add eggs one
at a time, mixing well after each addition. Blend in vanilla.
In medium bowl, combine
flour, baking powder, baking soda, and salt. Add to cream
cheese mixture alternately with milk, mixing well after each
addition.
Pour into greased and
floured 13" x 9" baking pan. Dot with jam and drag
knife through jam drops swirling through batter several times
to create marble effect.