HEAT oven to 400°F.
COMBINE first 4 ingredients; spread onto rimmed baking sheet.
MIX cream cheese spread, mozzarella, pesto and milk until blended; spread onto bottom of 9-inch pie plate.
BAKE tomatoes and cream cheese mixture 10 to 15 min. or until cream cheese mixture is heated through and tomatoes start to burst, stirring tomatoes after 8 min. and removing cream cheese mixture from oven after 10 min.
SPOON tomatoes over cream cheese mixture. Serve with toast slices.