Preheat oven to 450°.
Cut each zucchini in half lengthwise; scoop out pulp, leaving a 1/4-inch-thick shell. Reserve pulp for another use. Arrange zucchini shells in a single layer in a 13 x 9-inch baking dish coated with cooking spray.
Combine basil and next 7 ingredients (through pepper), stirring well with a whisk. Divide mixture evenly among shells, pressing gently. Bake at 450° for 20 minutes or until zucchini is tender. Garnish with parsley, if desired.
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