Preheat broiler. Arrange zucchini in a single layer on a greased baking sheet. Broil 3-4 in. from heat just until crisp-tender, 1-2 minutes per side., Sprinkle zucchini with salt and pepper; top with sauce, cheese and pepperoni. Broil until cheese is melted, about 1 minute. Sprinkle with basil.