HEAT oven to 400ºF.
DRAIN tomatoes, reserving liquid. Brown meat in medium skillet, adding reserved tomato liquid for the last 5 min.; drain. Return meat to skillet; stir in half the cheese sauce.
UNROLL pizza dough; cut in half. Press half the dough onto bottom and up side of 9-inch pie plate. Spread meat onto bottom of crust; top with tomatoes and half the remaining cheese sauce.
ROLL out remaining dough to 9-inch circle; place over pie. Seal edges with fork.
BAKE 15 min. or until golden brown. Top with lettuce and remaining cheese sauce.