HEAT oven to 400ºF.
BRING broth and cream cheese spread to boil in saucepan on medium-high heat, stirring constantly. Cook and stir until cream cheese is melted and mixture is well blended. Remove from heat.
PLACE 1/3 of the potatoes in 9-inch square baking dish; cover with layers of half each of the leeks and artichokes. Sprinkle with 1/4 cup shredded cheese. Repeat all layers; top with remaining potatoes and cream cheese sauce. Cover with greased foil.
BAKE 1 hour 20 min. or until potatoes are tender and top is golden brown, uncovering and topping with remaining shredded cheese after 45 min.