PREHEAT oven to 400° F.
COMBINE spinach soufflé, cream cheese, 3/4 cup Parmesan cheese, mayonnaise and green onions in large bowl.
SLICE top off bread loaf; carefully remove soft bread from inside, leaving 1/2-inch-thick shell. Cut top piece and soft bread into bite-sized pieces. Spoon spinach mixture into shell; sprinkle with remaining 2 tablespoons Parmesan cheese. Wrap loaf in foil, leaving filling exposed.
BAKE for 35 to 40 minutes or until heated through. Serve warm with bread pieces for dipping.