Heat oven 375° F.

Cook pasta in large sausepan as directed on package, omitting salt.Remove from pan, drain.

Meanwhile add marinara sause, tomatoes & cream cheese to same pan.Cook on medium heat until cream cheese is melted & mixture is well blended.Return pasta to pan. Mix well.

Layer the pasta mixture in 13 x 9 " baking dish. Cover with layers of sour cream, 1 cup mozzarella cheese & remaing pasta mixture. Top with mozzeralla & parameasn. Bake about 35 to 40 min. Until cheese is melted and a little brown on top. And bubbley.