COMBINE feta, olives, onions and peppers in medium bowl. Add dressing and lemon zest; mix well. Refrigerate 1 hour.
HEAT broiler. Cut baguette into 48 (1/4 inch-thick) slices. Place in single layer in baking pans or on rack of broiler pan. Broil 1 to 1-1/2 min. on each side or until lightly toasted on both sides.
ADD parsley to feta mixture; mix lightly. Spoon 1 Tbsp. of the feta mixture onto each toast slice just before serving.